People keep saying this in spite of evidence to the contrary. My engine makes 375-380 ft/lbs of RWT at 2200RPM. I think all of these builds that have posted graphs are showing VERY strong under the curve numbers.

This is with untouched runners or valve job. We should have the numbers up tomorrow on the CNC'd WCCH Stage 2 heads on this motor.

 

ok, you caught me regirgitating ( I cant spell, sound it out ) what people consider common knowledge. I know exactly what your saying, I just went through this myself with people saying big cams lose power down low and only gain up high. and all the dyno graphs I saw said, as you pointed out, otherwise.
and for the record, I wasnt stating that as fact. just that thats what Im looking out for by researching these heads, and there outputs. just want to make sure there isnt a "cost" but maybe you can have your cake and eat it too.

 

Racetronics fuel system is going on right now. We were running out of fuel on the dyno. CNC'd heads will be on today and maybe even dyno numbers but the end of the day. I know Ed's pedalling as fast as he can on this.

 

Kevin what did you go with? the twin intank setup? if you did... you should be fine then on the fuel issue!

 

Went with the Walbro 255 that comes with the Racetronics setup. It does have the harness that goes all the way to the alternator. I should be fine but I can always at a BAP if I need it. The harness is all setup for it.

 

Damian,

Your numbers are great. As I remember your heads are touched up? I really think these heads need at least some touch up to perform. My 490RWHP is the highest I've seen so far with untouched runners. let's see what the Stage 2 L92's do. Maybe today.

 

Final results:

Overall, I'm pretty happy with the numbers for a baby cam "Gentleman's Cruiser". The torque curve remained pretty much as before so the car will remain a blast to drive. Richard at WCCH really feels that the intake is now the limiting factor on this setup. He's probably right. Someone really needs to come out with a cost effective street manifold that will keep up with the setup.

Ed and I are talking about another cam option this morning and we'll see what develops.

First Setup/Final Numbers:



Head swap only:

 

cliff's notes? I can't see graph...stuck in the sandbox.

Marty

 

Original head/cam package: 475/437

New cam same heads: 490/463
(234/240 112lsa +0)

New cam and new heads: 500/466
(234/240 112lsa +0)
(CNC'd WCCH Stage 2 L92 heads)


I think that is the way it all goes...

 

Am I reading this right? You picked up only 10 rwhp with stg 2 ported heads over a off the shelf casting L92 head? Something doesnt seem right there.

 

well, thats all we kept hearing so far is that its tricky to port them cause you could screw them up easily. I dont think these are screwed up, Im just saying that porting might not yield as good a result as an aftermarket head does. its also possible that they just havent found the right matching cam to realize the gains from the port work. there brand new, it'll take a while to see what works best with them.

thanks alot for sharing what you figured out so far, keep it up. if you do decide to try another grind, fill us in. Id suggest maybe driving this one for a bit first, to see how this cam drives in that engine, that way you'll be able to see all the differences besides raw #s if you do decide to try another cam.
I still say those heads are a hell of a deal for out of the box performance at a cheap price. question still stands though, are they worth porting? 10RWHP does not add up to the extra cost, but like I said, maybe we just need to figure out still what kind of cam these heads do like.

 

Stay tuned.....

 

Cool...

You have "it" bad, like I did 2 years ago... 5 cams in one year...

(I got something BIG on the burner myself.... )

 

I thought I'd post in this one again, too, WKMCD. The other thread is more about L92 technology and what you're doing for the community to educate us, but this is about your particualr setup.

With that said, I'm glad you're doing this. I'm also glad you're enjoying the car. The results have been okay to date and it seems like everytime you do something you push the results higher.

Congrats.

 

After some consideration and talking with Ed and others, I've decided to drive the car for a while with this cam. I'm going to wait and see what happens with intake manifolds for this setup. I know someone who is going to take one apart and port it. I'll let him TOFTT on that.

I guess I'll just live with a 500RWHP 466RWT grocery getter for a while.

Thanks,

Kevin

 

Thank you for doing all of this testing, you were very couragous for trying something that knowbody else has done, but many of us wanted to know. We have all learned a lot from your "experiment". I really think you are right about the intake being the bottle neck now. I hope someone out there steps up and produces an intake for these heads that makes crazy power, and it would be real nice if it was affordable.

 

Ed's been tuning the car and sent me some initial driving impressions:

Kevin, you are going to absolutely LOVE the low speed driveability. After a couple tweaks, went for a spin. How about 50 MPH in 6th gear at 1200-1300 RPMs? How you like them #s!!! VERY nice low speed manners, and SICK power. You wanted the best of both worlds, well, thats what ya got. I've got some more tuning on it, not much, but I'll be posting a summary late tomorrow.
I really think we knocked it out of the park!!

Not too shabby for a 500RWHP grocery getter.

 

guys need to put a big cam at those l92 heads peaking flow intake .650+ and .700+ exhaust

 

Maybe somebody will but it's going to take a different intake than the L76. This is definitely not a max build but it turned out well for my purposes.

 

congrats with the setup bro- now time to enjoy it