100 Cams & 100 posts. need help
Thread Starter
Racer
Joined: Dec 2015
Posts: 276
Likes: 13
From: Austin, TX
100 Cams & 100 posts. need help
10.70-1 CR , HSR, 210cc, w/ 383 build ,with 3k stall.
XFI with 113 lsa?
Comp 291THR7 with 107 lsa?
110 lsa for 2-6500 rpm
108 lsa for 2-6500 rpm?
236/240 duration?
XFI with 113 lsa?
Comp 291THR7 with 107 lsa?
110 lsa for 2-6500 rpm
108 lsa for 2-6500 rpm?
236/240 duration?
Last edited by Street89vette; Nov 23, 2017 at 12:39 AM.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
You want a wide LSA like at least 112 to work well with the computer. Search a dynamic compression ratio calculator you can use to select a cam with the duration to match your desired dynamic compression ratio.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
Intermediate
Joined: Jul 2017
Posts: 44
Likes: 1
From: Newcastle Oklahoma
Cam
Would a 108 lsa be more streetable?I don't want to have to use a stall and a 12:20 car is all i want.
Safety Car
Joined: Feb 1999
Posts: 4,724
Likes: 16
From: Little Elm TX
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
Intermediate
Joined: Jul 2017
Posts: 44
Likes: 1
From: Newcastle Oklahoma
Hsr
If all you want is a 12.20 car.... then sell the HSR, put on some ASM long tube runners or a used superram intake, put a tight 2400 rpm converter, hence streetability will be docile..... you could run the LPE 211 or 219 cam, both very friendly and on a 112lsa..... your car would drive smooth and pleasant no matter the situation.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
Racer
Joined: Aug 2016
Posts: 354
Likes: 54
If all you want is a 12.20 car.... then sell the HSR, put on some ASM long tube runners or a used superram intake, put a tight 2400 rpm converter, hence streetability will be docile..... you could run the LPE 211 or 219 cam, both very friendly and on a 112lsa..... your car would drive smooth and pleasant no matter the situation.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
Beach Bum - you are still around? I haven't seen you post in ages.
My old screen name was AKS Racing and you used to offer advice when I was in the deep 10s. Assuming you moved on to bigger and better vettes judging by your pic.
Thread Starter
Racer
Joined: Dec 2015
Posts: 276
Likes: 13
From: Austin, TX
You want a wide LSA like at least 112 to work well with the computer. Search a dynamic compression ratio calculator you can use to select a cam with the duration to match your desired dynamic compression ratio.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
ps: for dirttracker: HSR "holley stealth ram" OCD "obsessive compulsive disorder" lol;: laughing out loud.
Last edited by Street89vette; Nov 24, 2017 at 10:14 AM.
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Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
That helps but there is no information on the piston valve relief's or dish or done. And head chamber volumes can vary alot from advertised. Best method is to measure both the head chamber and above piston volumes with liquid.
Next step would be to find a dynamic c.r. calculator that you can use. Expecting someone else to crunch the numbers for you on the faceless internet is begging for error. Now you could ask someone to verify your choice and discuss how to determined what you got. Myself I don't have that much free time and wouldn't try it even if paid to do it as I just have more interesting things to do.
Good luck.
Next step would be to find a dynamic c.r. calculator that you can use. Expecting someone else to crunch the numbers for you on the faceless internet is begging for error. Now you could ask someone to verify your choice and discuss how to determined what you got. Myself I don't have that much free time and wouldn't try it even if paid to do it as I just have more interesting things to do.
Good luck.
Racer
Joined: Dec 2013
Posts: 419
Likes: 5
From: Bel Air Maryland
My 383 has 11.2 to 1 compression, LE 2 heads, Lunati cam 231*/239* duration .571"/.589" lift, A4 trans, 3400 stall, 4.10 gears and lousy Nitto tires but still runs 11.70s all day even with a ridiculously poor 1.9 second 60 foot time. Better tires and better driving should give me 11.30s or better. That said, she is still very easy to drive on the street.
Thread Starter
Racer
Joined: Dec 2015
Posts: 276
Likes: 13
From: Austin, TX
ok, got the math just looking for cam suggestions please thank you
You want a wide LSA like at least 112 to work well with the computer. Search a dynamic compression ratio calculator you can use to select a cam with the duration to match your desired dynamic compression ratio.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.
Or well you can take best guesses from the faceless internet all day long. Good luck with that.
Cam clearance on stroker rods should be ok under .600 lift but have not found cam.
here is my exact setup on summit compression calculator. not sure if it is static or dynamic ?
Bore: 4.030
Stroke: 3.75
Heads: 64cc
Piston: +5
Deck: 0.024
Gasket: '020 still pending.
Compression Calculated @ 11.0-1
Stall: 3000-3200rpm
Auto: new rebuild 700r4 + shift kit 700-2-3 (oil cooler)
Header: long tube
Intake: holley stealth ram
210cc heads 2.02 int
Flow Numbers
Lift Intake Exhaust
0.100 67.9 52.2
0.200 142.2 110.8
0.300 193.6 160.2
0.400 238.9 197.7
0.500 272.7 223.9
0.600 295.1 235.8
flowKooler water pump
cchampion 3row
high pressure oil pump
7qt moroso pan
dual fans 2800cfm
1.6 roller rockers
Camshaft :??? xfi280? Lpe219? xfi292? any suggestions appreciated
Last edited by Street89vette; Nov 24, 2017 at 11:38 PM.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
If all you want is a 12.20 car.... then sell the HSR, put on some ASM long tube runners or a used superram intake, put a tight 2400 rpm converter, hence streetability will be docile..... you could run the LPE 211 or 219 cam, both very friendly and on a 112lsa..... your car would drive smooth and pleasant no matter the situation.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
And quite frankly, you'd probably still run in the 11's.
good luck with whatever direction you go in.
And here I was thinking of pulling my mega-ported semi-siamesed SLP runners in lieu of an HSR!!!
Street-only 383 application with a 6-sp, AFR 195's, and SR cam.
Racer
Joined: Aug 2016
Posts: 354
Likes: 54
What are the SR cam specs? It is not often that you hear of someone running a solid roller cam with long tube runner TPI set-up. This is a first for me.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Just finishing short block torque and clearance specs tonight.....
here is my exact setup on summit compression calculator. not sure if it is static or dynamic ?
Bore: 4.030
Stroke: 3.75
Heads: 64cc
Piston: +5
Deck: 0.024
Gasket: '020 still pending.
Compression Calculated @ 11.0-1
Stall: 3000-3200rpm
Auto: new rebuild 700r4 + shift kit 700-2-3 (oil cooler)
Header: long tube
Intake: holley stealth ram
210cc heads 2.02 int
Flow Numbers
Lift Intake Exhaust
0.100 67.9 52.2
0.200 142.2 110.8
0.300 193.6 160.2
0.400 238.9 197.7
0.500 272.7 223.9
0.600 295.1 235.8
......1.6 roller rockers
Camshaft :??? xfi280? Lpe219? xfi292? any suggestions appreciated
here is my exact setup on summit compression calculator. not sure if it is static or dynamic ?
Bore: 4.030
Stroke: 3.75
Heads: 64cc
Piston: +5
Deck: 0.024
Gasket: '020 still pending.
Compression Calculated @ 11.0-1
Stall: 3000-3200rpm
Auto: new rebuild 700r4 + shift kit 700-2-3 (oil cooler)
Header: long tube
Intake: holley stealth ram
210cc heads 2.02 int
Flow Numbers
Lift Intake Exhaust
0.100 67.9 52.2
0.200 142.2 110.8
0.300 193.6 160.2
0.400 238.9 197.7
0.500 272.7 223.9
0.600 295.1 235.8
......1.6 roller rockers
Camshaft :??? xfi280? Lpe219? xfi292? any suggestions appreciated
Well when I use Summit's c.r. calculator using your specs I get 10.74 static c.r.! That's quite a difference. And what I've been trying to say is that since you have the block on the table/stand you could get very accurate volume measurements (using liquid) instead of using published specs that can be unreliable.
If you must I suggest a simple dynamic calculator to try several different cam profiles for the dynamic c.r. that you want. I found this calculator by United Engine Machine that looks to be as simple as it gets: https://www.uempistons.com/index.php...3c8dd514d00dd2
I hope the link works for you. Good luck.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Here's the official link for the SR cam specs...
https://www.lingenfelter.com/PDFdown...L210035087.pdf
Thread Starter
Racer
Joined: Dec 2015
Posts: 276
Likes: 13
From: Austin, TX
Well when I use Summit's c.r. calculator using your specs I get 10.74 static c.r.! That's quite a difference. And what I've been trying to say is that since you have the block on the table/stand you could get very accurate volume measurements (using liquid) instead of using published specs that can be unreliable.
If you must I suggest a simple dynamic calculator to try several different cam profiles for the dynamic c.r. that you want. I found this calculator by United Engine Machine that looks to be as simple as it gets: https://www.uempistons.com/index.php...3c8dd514d00dd2
I hope the link works for you. Good luck.
If you must I suggest a simple dynamic calculator to try several different cam profiles for the dynamic c.r. that you want. I found this calculator by United Engine Machine that looks to be as simple as it gets: https://www.uempistons.com/index.php...3c8dd514d00dd2
I hope the link works for you. Good luck.
moroso pan hits against oil pickup... 8.25 pan... 8.25 pickup. lol
Last edited by Street89vette; Nov 25, 2017 at 11:59 PM.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
I use alcohol with food coloring in it. If you can find 1/4" plexiglass you can make your own cover and drill a hole with a nice wide chamfer on it. I'm still using the plexiglass plate I bought decades ago and I think it was a Comp Cams kit but you can find the graduated (ml) cylinder on line. I asked the pharmacist at Target for some graduated syringes (no needle) and got a handful of 5cc for free.
I use petrol jelly to seal the plexiglass and a thick grease to seal the crivece between piston and cylinder wall. Don't expect everything to seal w/o bubbles the first try. Keep working with it until you get it where you can repeat it accurately. Clean parts should be easier to work with than used parts. Here's a link to my camaro's LT1 liquid measurements with pix: https://camaroforums.com/forum/lt1-l...mes-ccd-81437/
That HSR looks pretty bad azz and your motor is looking great to. Almost to good looking to install and run . I would hate to get that one dirty.
I think you will have alot of self satisfaction once you get it done.
I use petrol jelly to seal the plexiglass and a thick grease to seal the crivece between piston and cylinder wall. Don't expect everything to seal w/o bubbles the first try. Keep working with it until you get it where you can repeat it accurately. Clean parts should be easier to work with than used parts. Here's a link to my camaro's LT1 liquid measurements with pix: https://camaroforums.com/forum/lt1-l...mes-ccd-81437/
That HSR looks pretty bad azz and your motor is looking great to. Almost to good looking to install and run . I would hate to get that one dirty.
I think you will have alot of self satisfaction once you get it done.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
BTW I need to ask what are the holes on the back of the HSR plenum for? As far as I know the HSR doesn't have EGR provision. But what else can bolt on there??
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
