This guy is awesome. I sent my heads to him a couple of weeks ago and was told to expect them sometime next week. That's crazy fast. Here are the numbers he sent me. Not an expert on numbers but they look great compared to most of the numbers I have seen here. Thumbs up!!

.1 67/50
.2 133/102
.3 185/133
.4 238/157
.5 268/175
.6 277/187

Any of you guys know what comp ratio I will be at with a 0.010 mill? I think my cambers are pretty much stock.


Jeff D.

 

stock valves?

 

2.00/1.56

Jeff D.

 

Mind telling me what he charges to get those kind of #'s out of your stock heads? I am thinking of sending him mine in the near future. PM me if you don't want to post it.

Thanks.

 

Ditto, what he said.

 

I would call him up. He had various prices depending on the amount of work involved, parts that you wanted to use, ect.

Jeff D.

 

Nice flow on the intake, but the E/I of ~69% isn't too good. You should use a cam with a wide split pattern (in the range of 10+ degrees more exhaust than intake duration) for best results.

Good luck.

Rich Krause

 

Can you explain? what's good? and why?
I read some of your other post. So I have an idea. Sort of too technical for me though. I can always sale my cam an get another. Hell, the budget is out the window anyway.

Jeff D.

 

These are Ferrea 2.00/1.56 valves.

Flow #'s are with no pipe on exhaust.

NightTrain66

 

Poorman, spit it out, we all want to know what YOU paid to get THOSE numbers......

 

also, take post some pictures of the intake/exhaust/ and chamber if you can!!! Excellent numbers!!!

 

with .010 milling you'll see exactly .22 compression change, so if you were at 10.4:1 stock it'll be 10.62:1, and with felpro 1074 you'll have 10.9:1 about.

 

Thanks for the reply Bunker. Been trying to figure this out. That really helps.

Lloyd, didn't know you hooked me up with that brand of valves. This is a good day. Thanks man.

Jeff D.

 

No doubt the exhaust #s would increase with a pipe installed but it's not that big a deal.
Where it counts.... from .200-.400 lift, the ratio averages to 72%.

An engine we just put together for a race car using 18* castings (yep, it's internal combustion like your street car) flowed less than 67% at peak intake valve lift and only averaged 68% from .2-.400 lift. Poor in most peoples book but I've seen "worse".
After dyno testing three camshafts we ended up with 779 hp and 556 lbs-ft of torque n/a, 994 hp and 791 lbs-ft of torque on a 200 shot. The best results were found with a cam using 6* more exhaust duration. The difference in the three cams primarily being the amount of the duration split. Lift, LSA and advance was all identical and the three were chosen based on the builder's (Shafiroff) wave simulation data, utilizing pressure-volume diagrams.
The other two cams utilizing 8* and 10* splits were down on average torque some 10 lbs-ft from 4500 rpm on up with the 10* split showing the most average torque loss.
Again, it can be difficult painting with broad brush strokes and I believe the intake/exhaust ratio thing is a little overplayed. Never really works out the way you think it will in the real world. A ratio doesn't tell you how well the port flows for it's size and if you ever get the chance to pick the brain of a top-shelf porter you'll find out that port shape and average velocity is what it's all about.

Nice numbers!

-Mindgame

 

Thanks Mindgame for clearing that up alittle. Basically, it's just one of those things for getting every last bit of power out of the package. It is not going to be a track only car so it's not something I need to bust my brains over. I am more concerned on getting the PCM tuned correctly. Hope pcmforless has a good one for this setup. The nearest dyno tune is 5hrs away.

Jeff D.