cam for LT1? dyno #s?
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
cam for LT1? dyno #s?
Everyone,
I was wondering if anyone had dyno numbers and opinions on drivability
for a cam that would fit my LT1. I know of the LT4 HOT cam, but I don't
want to go with that because 1) it only makes the HP way up high (5500 up),
2) I hear that you have to give it more gas to start the car from a stop.
What cam specs should I be looking at if I want 30 hp gain but smooth
idle and long valve train life?
I was wondering if anyone had dyno numbers and opinions on drivability
for a cam that would fit my LT1. I know of the LT4 HOT cam, but I don't
want to go with that because 1) it only makes the HP way up high (5500 up),
2) I hear that you have to give it more gas to start the car from a stop.
What cam specs should I be looking at if I want 30 hp gain but smooth
idle and long valve train life?
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: cam for LT1? dyno #s? (sothpaw2)
1) it only makes the HP way up high (5500 up),
2) I hear that you have to give it more gas to start the car from a stop.
2) I hear that you have to give it more gas to start the car from a stop.
that means you just need gears to get your engine in that power range quicker
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Re: cam for LT1? dyno #s? (sothpaw2)
I am running a Comp Cam custom grind camshaft in my LT1. It is a little less radical than the GMPP Hot Cam. Cam specs: 212/224 duration @ .050, 520/536 lift-1.6 rockers, 112LSA. This camshaft idles pretty smooth, little if any loss of low end torque, and is really strong above 3000 rpm's.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: cam for LT1? dyno #s? (sothpaw2)
If you're running a 6-spd you're driveability won't suffer at all with the Hot Cam. It's true that it makes good power up high but nowhere does it really make less power than the stocker.
I've got a bunch of dyno graphs for my car as it has progressed with the hot cam in stages, feel free to take a look http://www.wku.edu/~nathan.plemons/h..._corvette.html
I've got a bunch of dyno graphs for my car as it has progressed with the hot cam in stages, feel free to take a look http://www.wku.edu/~nathan.plemons/h..._corvette.html
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Re: cam for LT1? dyno #s? (sothpaw2)
STL94LT1,
Do you have before after dyno graphs? Something less agressive,
more driveable than the Hot cam is what I'm after.
Nathan,
Thanks so much for the graphs. They are a real help. I wish there
were more dyno graphs like these out there.
Do you have before after dyno graphs? Something less agressive,
more driveable than the Hot cam is what I'm after.
Nathan,
Thanks so much for the graphs. They are a real help. I wish there
were more dyno graphs like these out there.
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: cam for LT1? dyno #s? (sothpaw2)
I have a Cam that is very similar to STL94LT1's. It is a Comp Cam custom grind 210/224 with 112 LSA. The lift is .501/.499 @ .050 using 1.5 RR's, and .534/.531 with 1.6 RR's. It idles very smooth at 900 rpm with just the slightest lope to it.
I did this mod with a number of others so it is hard to say what it got me powerwise, but I'm sure it should be worth at least 20 - 25 hp. Here was my dynosheet from last year. I will be getting it done again after the gears and tuning get done...
Mike
[Modified by luvmy92, 2:25 PM 2/4/2003]
I did this mod with a number of others so it is hard to say what it got me powerwise, but I'm sure it should be worth at least 20 - 25 hp. Here was my dynosheet from last year. I will be getting it done again after the gears and tuning get done...
Mike
[Modified by luvmy92, 2:25 PM 2/4/2003]
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Re: springs? lifters?
Luvmy92, 94ST,
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
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Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Re: springs? lifters? (sothpaw2)
94ST,
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
Also, I reused my lifters. Unless you car has very high mileage, you can reuse yours.
Racer
Joined: Oct 2001
Posts: 466
Likes: 27
From: Hendersonville tn
Re: cam for LT1? dyno #s? (sothpaw2)
I'm using the GMPP 846 cam and love it. Bigger still than the HOT cam but drivability is great. Idles nice but slightly noticeable lope. With LT1-edit I tuned it to run quite smooth and no loss of drivability. On the dyno it produces a nice flat torque curve with more than 325 lb/ft everywhere between 2000 and 6000 rpm. Peak torque is 356 lb/ft at 4000 and peak HP was 368rwhp at 6000 rpm. It's 222/230 deg duration @ .050
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: springs? lifters? (sothpaw2)
Luvmy92, 94ST,
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
Did both of you replace your stock springs? with what? And, did you
replace the lifters when you changed the cam? If so, how much did
the new lifters cost?
Mike
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Re: cam for LT1? dyno #s? (sothpaw2)
Everyone,
I was wondering if anyone had dyno numbers and opinions on drivability
for a cam that would fit my LT1.I know of the LT4 HOT cam, but I don't
want to go with that because 1) it only makes the HP way up high (5500 up),
2) I hear that you have to give it more gas to start the car from a stop.
I was wondering if anyone had dyno numbers and opinions on drivability
for a cam that would fit my LT1.I know of the LT4 HOT cam, but I don't
want to go with that because 1) it only makes the HP way up high (5500 up),
2) I hear that you have to give it more gas to start the car from a stop.
It probably wouldn't work so well with an auto. The LT4 after all was 6 speed only. Which do you have?
The first question my engine builder asked is stick or auto. He looked at my car and said no problem with the cam lope because you have the six speed.
If you have an auto and aren't going to go with big rear gears, then you are limited in the cam specs that will work for you.
Thread Starter
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Re: cam for LT1? dyno #s? (94lt1torchred)
'94,
Meeting near BWI would be super! I work in that region. My car is a six
speed, so the drivability would be a good comparision. Are you doing anything else with the car?
luvmy92,
You mentioned a good idle and minimal lope. Do you have to give it more
gas to start or does it feel like stock? My car might be used in stop/go
traffic from time to time...
Meeting near BWI would be super! I work in that region. My car is a six
speed, so the drivability would be a good comparision. Are you doing anything else with the car?
luvmy92,
You mentioned a good idle and minimal lope. Do you have to give it more
gas to start or does it feel like stock? My car might be used in stop/go
traffic from time to time...
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Re: cam for LT1? dyno #s? (sothpaw2)
'94,
Meeting near BWI would be super! I work in that region. My car is a six
speed, so the drivability would be a good comparision. Are you doing anything else with the car?
Meeting near BWI would be super! I work in that region. My car is a six
speed, so the drivability would be a good comparision. Are you doing anything else with the car?
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Re: cam for LT1? dyno #s? (sothpaw2)
Heads and Hotcam, that's exactly what I'd like to do if the price is
survivable.
Who is your builder?
survivable.
Who is your builder?
He won't take you in unless he knows you. Even though he knows my brother from high school, he wouldn't take me in until he looked over my car and thought it worthy. He has enough work from racers.
