221/221 duration, .542"/.542", 114lsa



Im looking for a cam thats going to peak out around 6,000rpms to run 10psi from eithe a GT42 or a t76..does this sound like a good cam?

 

It depends somewhat on cubic inches versus turbo size, then camshaft. For starters, that cam will probably peak well before 6000 rpm regardless of cid. My guess is that it will peak around 5600 - 5700 rpm.

The data that I've gathered on the T76GTS is as follows:

363 cid, 224/236-114, +0 adv, 5900 rpm
383 cid, 224/236-114, +0 adv, 5750 rpm
388 cid, 224/236-114, +4 adv, 5700 rpm
377 cid, 230/230-114, +4 adv, 5800 rpm

You see, the rpm at peak looks like it's related more to cid than the cam spec's. The T76GTS runs out of steam sooner with the bigger engines so the hp peaks sooner. I bet that you'd have to go up to something like 230 on 350 cid or 236 on 383 to get a 6000 rpm peak. At that point, you have to ask yourself, are you helping or hurting the overall combination just to get it to peak at 6000 rpm? Perhaps it would be better to cam if for 5600 to match the turbo the best.

 

its a 355. If a stock cam peaks around 5700 i dont see how a cam this much bigger peaks the same. I was told a 222/222 would peak around 6200.

 

My goal isnt to get the most out of the turbo, its to make the most power I can up to 6k and I dont want to spin past that. (2 bolt studded mains, stock crank)

 

I don't think 222/222 would peak that high, even NA. Here's an interesting dyno test for you:

http://www.turbomustangs.com/project...tdavisdyno.php

302 cid, 226/226 cam, T74GTS turbo, peak hp at only 5350 rpm. So, less cubes, more cam, similar turbo, and a low hp peak (not to be confused with low peak hp).

I'm running a 224/236 cam and it works quite well. I tried a 226/226-114 and wound up switching back to the old 224/236 cam. I've been itching to try 230/236-114 or even 112, but I dont think it would give me more than 25 hp which is 1 psi boost for me.

That's my recommendation for you. 230/236-114, +4. It will make peak power around 6000 rpm on 355 cid with a T76GTS.

 

Don't get me wrong, the 221/221 cam will be a beast, but it will peak around 5200 - 5400 rpm. I just think you'll make more power at any given boost level with 230/236 and it will rev a little higher.

 

dont mean to highjack but what do you think about a 230/236 112 VS. a 218/225 on a 114 with a P600b on a 383 Mike? those are the two cams that i have

 

Oh. I just dont want to bring the car past 6k I know id be leaving power on the table but im concerned with making this motor last a little while and I know I can make more HP if I keep the revs down safer.

 

Stock cam peaks @ 5250rpm...5300rpm when I had full bolt-ons. Just for reference, my 230/236 114LSA N/A setup peaked @ 6000rpm...my new 224/224 cam hopefully will peak around 5600-5800 in a 383ci...I dont know though.

 

Superchargers are a little trickier than turbo's. The 230 should peak a little higher due to the IVC being 4 deg later, but there's no guarantee you'll get more hp since it has 15 deg more overlap. In every dyno test I've seen, turbo's seem to make more power with more overlap, but superchargers could go either way.

 

well i think im gonna take a risk and go with the bigger one.. im gonna give the other one back too the guy i bought the shortblock from i had too decide and give him one of them too sell once i decided which one i was gonna run (he ran the smaller one with the same engine/blower but with better heads at 12psi) i guess atleast it will sound good haha hopefully it will make and much or more power than the small one

 

How about this cam Mike..

220/232 duration @.050

.498/.507 lift w/1.5 rocker .525/.535 lift w/1.6 rocker

114+2 LSA (has 2 degrees of advance ground in).


would something like that work with a turbo or be no good? cuz for the price its almsot worth it being 150$ cheaper for another cam that would maybe give me 5hp




would that cam work for my power range of 550-600rwhp?

 

Expect power numbers similar to the 221/221 cam. The exhaust duration doesn't have a dramatic affect on power on most combinations. However, the lift is kinda' weak, though, which makes me wonder how lazy the ramp rates are.

Mike

 

FWIW, the thing about overlap and blowers is a tradeoff. IF you have excess blower capacity (think of an alcohol Hemi), overlap is good as it blows the end gasses clean out of the cylinder. Of course, a lot of fresh fuel and air goes with it (hence the flames). With the small centrifugals we use, you can't afford to blow too much of the charge out the exhaust. Experience shows that for typical setups you want very little overlap at 0.050" and at least 10 degrees more exhaust duration to partially compensate. This leads to relatively wide LSA's (113-116 degrees work best with typical durations).

Rich

 

Yeah, I was thinking the same thing.You think this cam is capable of 550-600rwhp? Im just looking for something to get me through the year thats very streetable and makes around 550-600rw with the 76mm on 10-12psi