turbo cam specs what do u think?
turbo cam specs what do u think? Hi guys
Im building a turbo motor whic started out as a nitrous motor.
355ci
vcjr coverted to efi
proted pro 1s
8.5:1 - 9:1cr
4340 bottom end
and the clinthcer 256/264 @50 610/630 lift solid roller
what do you think of this?
now the poweradder either: t76/t88 or novi 2000/ t-trim @20lbs bst
sounds like a 7200rpm motor should I asume this is correct
thanks!
Im building a turbo motor whic started out as a nitrous motor.
355ci
vcjr coverted to efi
proted pro 1s
8.5:1 - 9:1cr
4340 bottom end
and the clinthcer 256/264 @50 610/630 lift solid roller
what do you think of this?
now the poweradder either: t76/t88 or novi 2000/ t-trim @20lbs bst
sounds like a 7200rpm motor should I asume this is correct
thanks!
TECH Enthusiast
Joined: Nov 2003
Posts: 689
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My old cam was 238/232 with a little bit more lift that you listed there. Remember turbos carry the power a lot higher into the powerband than a naturally aspirated car does, so if you have a N/A cam for a 6500 RPM motor you could expect that to still be making power at 7500 with turbos. Too big IMO, you'd get better results with less duration.
Originally Posted by jester1
I knew I forgot something 
, the lobe sep is 112 deg.
, the lobe sep is 112 deg.My old cam was punny, 228/224 112 LSA less than .550 lift
It made decent power, but was kinda peaky. And real doggy down low/off boost.
My new cam
251/248 .690 LSA 115 ICL 113
power is flat and broad, but we've yet to find the peak. It just keeps climbing, at least at 7200 it does.
Don't know about 20 psi though, it just spun the tires on the dyno at 18
for reference
We had a 230/230 LSA 114 .620 lift hyd cam in a 355 LTI, LT4 manifold, 15 psi that made 750 RHWP on a mustang dyno.
We just up'd that to a 242/242 LSA 115 .690 solid roller.
It's not too big, if you plan to spin the **** out of it
But you could go smaller, make the same or similar power in a more sane RPM range.
something to think about
We had a 230/230 LSA 114 .620 lift hyd cam in a 355 LTI, LT4 manifold, 15 psi that made 750 RHWP on a mustang dyno.
We just up'd that to a 242/242 LSA 115 .690 solid roller.
It's not too big, if you plan to spin the **** out of it
But you could go smaller, make the same or similar power in a more sane RPM range.
something to think about
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Originally Posted by jester1
Will insufficient head flow drop the rpm peak? Why use a cam with less exhaust duraion than intake?
The single versus reverse spilt versus traditional split pattern has been hashed here before. My personal thing with it is, get all the intake charge in the motor you can w/ the longer intake duration and keep the exhaust shorter to keep the exhaust energy up. Since you're fighting a large backpressure on the hot side it makes sense to me to keep the valve open time to a minimum and get it out quick.
I'm no cam expert by any means, but the reverse seems to work for me.
Harlan,
I am running the 227/224 cam for the same reasons you mentioned... makes sense to me.... but sometimes i wonder if it is too aggressive? I am stepping up to a T76 and a/w IC as I am out of turbo now... so I hope this cam will work with more boost, do you think I should put something milder in? I am shooting for 650rwhp+
I am running the 227/224 cam for the same reasons you mentioned... makes sense to me.... but sometimes i wonder if it is too aggressive? I am stepping up to a T76 and a/w IC as I am out of turbo now... so I hope this cam will work with more boost, do you think I should put something milder in? I am shooting for 650rwhp+
What's the LSA on it?
Don't get me wrong, my 228/224 made 700+ RWHP on a mustang dyno at 15 psi and went 143+ @3600 lbs, it worked. Just wasn't optimal w/ the 112 LSA. I would have liked a wider power band, but would have had to spin it a little more to get the peak.
Don't get me wrong, my 228/224 made 700+ RWHP on a mustang dyno at 15 psi and went 143+ @3600 lbs, it worked. Just wasn't optimal w/ the 112 LSA. I would have liked a wider power band, but would have had to spin it a little more to get the peak.
