Cam help needed
Thread Starter
Instructor
Joined: Dec 2014
Posts: 171
Likes: 0
Cam help needed
I'm doing the heads and cam on my c5z. Here's my clurrent set up and baseline numbers.
Mods:
Lg super pro 1 3/4 LT's
Fast 92 92 TB
Vararam
3.90 gear
Tune
Car made 412rwhp/400rwtq (just dyno numbers don't go nuts on me)
I am installing:
ati 10% underdrive pulley
Tfs 205 heads (56cc chambers)
My cam delima is between the tick sns street heat 2
231/235 625/605 113+3
BTR stage 2
227/234 614/576 113+2
BTR stage 3
231/242 617/592 112+2
And an EPS cam
226/234 598/601 113+3
Wanting good average power that will carry to about 6800rpms. I do some roll racing and a trip to the track about once a month. Which will I see the best average power gain across the board from.
Mods:
Lg super pro 1 3/4 LT's
Fast 92 92 TB
Vararam
3.90 gear
Tune
Car made 412rwhp/400rwtq (just dyno numbers don't go nuts on me)
I am installing:
ati 10% underdrive pulley
Tfs 205 heads (56cc chambers)
My cam delima is between the tick sns street heat 2
231/235 625/605 113+3
BTR stage 2
227/234 614/576 113+2
BTR stage 3
231/242 617/592 112+2
And an EPS cam
226/234 598/601 113+3
Wanting good average power that will carry to about 6800rpms. I do some roll racing and a trip to the track about once a month. Which will I see the best average power gain across the board from.
Racer
Joined: Feb 2014
Posts: 326
Likes: 19
From: Decatur AL
I posted a reply in your other thread about the same topic. But in addition to what I said there, if you do street pulls and "roll racing" you may want to look at a lower LSA than a 113 to bring the torque curve down.
AMP Racing
Joined: Aug 2006
Posts: 10,758
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
One thing about the SS cam, is you'll likely have to fly cut the pistons. Maybe not, but likely yes.
A buddy of mine went 10.5x@133 with this cam and hand ported 243 heads.
Thread Starter
Instructor
Joined: Dec 2014
Posts: 171
Likes: 0
The street sweeper cam is pretty aggressive, but a good choice, especially since you already have a rear gear change.
One thing about the SS cam, is you'll likely have to fly cut the pistons. Maybe not, but likely yes.
A buddy of mine went 10.5x@133 with this cam and hand ported 243 heads.
One thing about the SS cam, is you'll likely have to fly cut the pistons. Maybe not, but likely yes.
A buddy of mine went 10.5x@133 with this cam and hand ported 243 heads.
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
The events will show you the characteristics your asking about.
Events, lobe profile and duration are the factors that should dictate your decision.
.
Last edited by LSOHOLIC; Dec 7, 2015 at 11:17 AM.
Thread Starter
Instructor
Joined: Dec 2014
Posts: 171
Likes: 0
Street sweeper:
236/240 631/610 111+3
Intake
10* BTDC
46* ABDC
Exhaust
54* BBDC
6* ATDC
16* overlap
Current cam that won't work
237/240 622/588 112+3
Intake
9.5* BTDC
47.5* ABDC
exhaust
55* BBDC
5* ATDC
14.5* overlap
cam I bought
232/236 604/604 113+3
Intake
6* BTDC
46* ABDC
Exhaust
54*BBDC
2* ATDC
8* overlap
Here's a cam degree calculator I used on Wallace racing
http://www.wallaceracing.com/cam-deg-calc.php
Last edited by Qkslvrc5z; Dec 7, 2015 at 06:17 PM.
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Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Events on street sweeper, vs cam I've tried, and cam I got
Street sweeper:
236/240 631/610 111+3
Intake
10* BTDC
46* ABDC
Exhaust
54* BBDC
6* ATDC
16* overlap
Current cam that won't work
237/240 622/588 112+3
Intake
9.5* BTDC
47.5* ABDC
exhaust
55* BBDC
5* ATDC
14.5* overlap
cam I bought
232/236 604/604 113+3
Intake
6* BTDC
46* ABDC
Exhaust
54*BBDC
2* ATDC
8* overlap
Here's a cam degree calculator I used on Wallace racing
http://www.wallaceracing.com/cam-deg-calc.php
Street sweeper:
236/240 631/610 111+3
Intake
10* BTDC
46* ABDC
Exhaust
54* BBDC
6* ATDC
16* overlap
Current cam that won't work
237/240 622/588 112+3
Intake
9.5* BTDC
47.5* ABDC
exhaust
55* BBDC
5* ATDC
14.5* overlap
cam I bought
232/236 604/604 113+3
Intake
6* BTDC
46* ABDC
Exhaust
54*BBDC
2* ATDC
8* overlap
Here's a cam degree calculator I used on Wallace racing
http://www.wallaceracing.com/cam-deg-calc.php
Man, those cams all have late IVC's for 6800 rpm max and no compression IMO.
If it were me I'd shoot for an IVC around 43- 45 and no more intake duration than 234....again, my opinion.
Some thing like....232/240 111+3
8
44
54
6
Compression & rpm would make a big difference. Unless I misunderstood your intentions.
Good luck....call BTR or EPS
.
Thread Starter
Instructor
Joined: Dec 2014
Posts: 171
Likes: 0
Didn't see any head work mentioned.....
Man, those cams all have late IVC's for 6800 rpm max and no compression IMO.
If it were me I'd shoot for an IVC around 43- 45 and no more intake duration than 234....again, my opinion.
Some thing like....232/240 111+3
8
44
54
6
Compression & rpm would make a big difference. Unless I misunderstood your intentions.
Good luck....call BTR or EPS
.
Man, those cams all have late IVC's for 6800 rpm max and no compression IMO.
If it were me I'd shoot for an IVC around 43- 45 and no more intake duration than 234....again, my opinion.
Some thing like....232/240 111+3
8
44
54
6
Compression & rpm would make a big difference. Unless I misunderstood your intentions.
Good luck....call BTR or EPS
.
Read the first post using tfs 205s with 56cc chambers. Figure out the compression at around 11.2-11.4:1 and I don't want to rev the motor over 6800 anyway. My brother slung the rod bolts through the oil pan on his car. Peak power is not the concern, average power is.
Last edited by Qkslvrc5z; Dec 8, 2015 at 11:16 AM.
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
205cc is smaller than the OEM runner if memory serves me correctly. But obviously your valve angle will be better, which helps breathing and PTV.
Any reason why you chose that head ? Either way, it should work good.
56cc on a 3.910x0.045 gasket will yield roughly 11.7 SCR. As you probably already know that small chamber will likely cause you to have to fly cut.
And another issue to consider is the IVC......for a low rpm (6800rpm redline) you want a IVC that is not to late. As to provide you with good mid-range power. But the caveat is, the earlier the IVC the more DCR you build. Which begins to push your octane requirements up.
Run some DCR calcs to see what I mean.....back in the day I ran 57cc on a 3.910x.045 with a 44* IVC on pump 91 oct....iirc DCR was roughly 8.7....but I had the chambers softened to cheat the timing a little and help with the lack of octane.
Like I originally said....I'd call EPS or BTR
Thank...
.
Last edited by LSOHOLIC; Dec 8, 2015 at 02:22 PM.
Thread Starter
Instructor
Joined: Dec 2014
Posts: 171
Likes: 0
Gotcha.....see it now, last line...
205cc is smaller than the OEM runner if memory serves me correctly. But obviously your valve angle will be better, which helps breathing and PTV.
Any reason why you chose that head ? Either way, it should work good.
56cc on a 3.910x0.045 gasket will yield roughly 11.7 SCR. As you probably already know that small chamber will likely cause you to have to fly cut.
And another issue to consider is the IVC......for a low rpm (6800rpm redline) you want a IVC that is not to late. As to provide you with good mid-range power. But the caveat is, the earlier the IVC the more DCR you build. Which begins to push your octane requirements up.
Run some DCR calcs to see what I mean.....back in the day I ran 57cc on a 3.910x.045 with a 44* IVC on pump 91 oct....iirc DCR was roughly 8.7....but I had the chambers softened to cheat the timing a little and help with the lack of octane.
Like I originally said....I'd call EPS or BTR
Thank...
.
205cc is smaller than the OEM runner if memory serves me correctly. But obviously your valve angle will be better, which helps breathing and PTV.
Any reason why you chose that head ? Either way, it should work good.
56cc on a 3.910x0.045 gasket will yield roughly 11.7 SCR. As you probably already know that small chamber will likely cause you to have to fly cut.
And another issue to consider is the IVC......for a low rpm (6800rpm redline) you want a IVC that is not to late. As to provide you with good mid-range power. But the caveat is, the earlier the IVC the more DCR you build. Which begins to push your octane requirements up.
Run some DCR calcs to see what I mean.....back in the day I ran 57cc on a 3.910x.045 with a 44* IVC on pump 91 oct....iirc DCR was roughly 8.7....but I had the chambers softened to cheat the timing a little and help with the lack of octane.
Like I originally said....I'd call EPS or BTR
Thank...
.
I went with EPS, Geoff is a great guy really, he's awesome to deal with. Would reccomend him to anyone. Also his shop is only about an hour from my house and dealing with someone fairly local is a big plus to me.
In the end my goal is to make good power under the curve that will carry over to the topend. And I don't have to rev my car over 6800 to make decent peak power.
Last edited by Qkslvrc5z; Dec 8, 2015 at 02:52 PM.
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
I bought the 205s because I wanted more average power instead of just peak, also the intake runners vary from car to car, I've seen some show 205 and some show 210. The 205s also yield smaller circumference chambers, better valve angles and stock size valves. Which intern allow more compression while still retaining good ptv. I'm using gm mls head gaskets. With the compression and mid range flow of the 205s I should see good power throughout the rpm range, and I may sacrifice some peak horsepower. But I'll gain power under the curve. My brothers car made 480whp but 420rtq. My buddy's made more tq but less hp and was dead even with my brothers car from a low roll. And it came down to the driver mod.
I went with EPS, Geoff is a great guy really, he's awesome to deal with. Would reccomend him to anyone. Also his shop is only about an hour from my house and dealing with someone fairly local is a big plus to me.
In the end my goal is to make good power under the curve that will carry over to the topend. And I don't have to rev my car over 6800 to make decent peak power.
I went with EPS, Geoff is a great guy really, he's awesome to deal with. Would reccomend him to anyone. Also his shop is only about an hour from my house and dealing with someone fairly local is a big plus to me.
In the end my goal is to make good power under the curve that will carry over to the topend. And I don't have to rev my car over 6800 to make decent peak power.
Cool...sounds like a good street combo. So OEM gasket is like .051. Which should lower your scr thus helping with the oct issue caused by the early IVC.
If you don't mind....what IVC did Geoff spec ??
FYI, Geoff has spec'ed my last few cams....great guy.
.