I bought a set of these to go in my stroker + GT35r. I was wondering if anybody here has run these cams. I have a BR stage 3 head so valve train is not a problem. The Piper cams have an advertised duration of 272 but in reality have a @1mm of 224 which is more then the HKS 280's that have a @1mm of 222. That makes the ramp of the Piper cams much more aggressive then the HKS 280's.

Here are the specs:

Piper Race cams:
Duration of 272 deg (advertised)
Duration of 224 deg @ 1mm
Lift of 12.0mm

For comparison sake here is what the wimpy old HKS 280's look like :

HKS 280:
Duration of 280 deg (advertised)
Duration of 222 deg @ 1mm
Lift of 10.8mm intake / 10.2mm exhaust

 

I recall a test with a GT35R equipped car whereby the Piper Road cams were down by a substantial amount of power (>50whp) as compared to a set of HKS 272s.

This seems difficult to believe, and I suspect the difference may be due to the difference in lobe centerlines. This being evident, I strongly suggest you get a good set of cam gears if you haven't already done so.

All HKS cams are ground on 110 deg lobe centerlines, while all Pipers use 108 Intake and 107 Exhaust. This means that in order to get a set of Pipers to match HKS cams as installed straight up (which isn't necessarily the best final setting), you'd need to use a setting of -1/+1.5 on the Pipers.

 

I am planning on running gears on it, I haven't seen to many guys playing with cam gears on a stroker yet so it should be interesting. I will do some testing this spring when she is all back in one piece.

 

I'm pretty sure those were the PIper rally cams, but I could be wrong though. I'm sure someone who isn't as lazy as I am will do a search and find out who is right.

 

He is correct, 108 int. and 107 ex. unless you meant road vs race. The road cams are about the same as the HKS 264's.

 

Then remember this:

+1/+1.5


If those cams behave as expected, it should work like an HKS 280 set at +2/0 (with more lift), which should get that GT35R to spool noticeably quicker, and shouldn't cost you anything up top. I hope you're planning on running race fuel or a methanol kit with a 15 gph nozzle. You're going to need it!

 

Yes, meth and a larger then stock nozzle. I am going to try and run the largest nozzle I can with some amount of sanity in case the kit should fail. I am running the BR (SMC) kit now. If everything works out the car should be pretty nasty on the street.

 

You have a 7.5 gph. You'll need the 15 gph. Record that setting I gave you, which should work very well with the stroker.

Oh yeah, I hope you have a good clutch.

 

Tilton carbon for a clutch. I was also thinking 15gph, I might end up mounting a 5 gal cell in the trunk for it, I am already putting in a 12 gal fuel cell so I have the firewall in there so I minds well take advantage it.

Thanks for the input on the cams, it will be the first settings I try.

 

While I haven't run Piper Race cams, I've been running the Piper Rally cams on 2.0L with a heavily ported head and oversized valves. With my set-up in back-to-back testing the Pipers out-performed a set of HKS 280 cams slightly at the top end, but the HKS had a slight bit more mid-range.

My car has known mid-range issues though (improper compression), so you might well see improvements there as well. I can't wait to get my car re-built with a stroker so I'll be able to better use the flow of these cams and my head.

+1 to Ted B. for his help with getting my cam gear timing sorted out.

 

I have the Rally Pipers and love them. I had HKS 272's before and think I am altogether with a better setup now.

 

I will be using the piper ultimate race cams with a 2.3.

The project should easily be completed within the month. so i'll keep everyone posted.

 

Those are the solid lifter cams arnt they?

 

yes