so what are you acctually arguing t2te50? I have missed your point..

Great results XH5LWEPN.. hurry up with the sound file/video!

i ran a 13.8 @ 97mph on wednesday at WSID......on street tyres.......in my xh xr8........its a 302 as well

Good s**t Justin, well done mate. You happy with that time? Was it what you were expecting?

What tyres were ya running? I bet it was a job to get some decent traction off the line.

sounds like you got yourself a tough ute.

good stuff man. not bad for a n/a 302

Cheers mate. Yeah i think the results are pretty impressive considering its only a baby V8, a little 302 that can mix it up with the GM boys with there LS1's and LS2's isnt doing to bad at all IMO.
I am eager to see where it makes its peak power, hopefully know at the end of the week.

yeah i sort of am happy with that time. i know theres more in it. i was stoked that i done it. and i was pretty consistant through the whole night. i can probably see a 13.5 in it before i start changing diff gears and using smaller diameter tyres etc.
i was running on my 18's all night. i smoked the clutch off the line to get that 13.8 but it then still started to break traction out of the hole then screamed 2nd and 3rd up the strip. i still need to think about a better dizzy, give it a service(hasnt had one in about 20k) and fine tune all that then maybe think about diff gears, probably modify the induction setup etc. but overall pretty happy with the result

You are a tool. You clearly haven't done your homework regarding aftermarket heads.

Your telling me the exhaust valve isn't much smaller in size to the inlet? TOOL is a pretty strong word and shouldn't be used so liberally.

From what I've been told single pattern is good for top end but doesn't give you the low end torque that a dual pattern cam will. Overlap, lift effec ting vacuum bla, bla, bla.

So thoswe this go for all aftermarket heads BOTTLEDUP? I was mentioning the general rule of thumb and you decide to have a go at me.

I suppose u are from the wild west. insults won't get u anywhere.

There's pics, a list of specs and a dyno sheet. I could understand getting pessimistic from a bit of discussion but the fact is its there in black and white with color pics also.

What more do you need?

What you have been told is a generalisation....The design of the camshaft is entirely dependant on the design of the engine. If the engine has small, poor flowing exhaust ports(like a stock 5.0) then longer duration and/or lift can help fix this some to some degree. However as soon as you port the exhaust and fit larger valves and fit headers the same is not necessarily true. Aftermarket heads almost always eliminate the poor flowing exhaust port.

Pete.

Results of dyno runs.
Idle is still an issue with 2031 cam.

Richie

You do not have the required permissions to view the files attached to this post.

Very nice results mate, always bit harder to get the power through the auto box. Popped in to BPT yesterday and Terry advised of your results.
Funny that the idle is still an issue with your cam, i thought mine would have been abit worse with my 110 LSA compared to the 112 on yours.

I stand by what I said. Unfortunately t2te50 you've opened your mouth about engines and components that you aren't familiar with. I'd suggest reading a few technical articles, and also perhaps checking out the 'POWERBUILDING' range of DVD's you can get from Rockets. They cover all aspects of engine design, especially relating to performance applications.

As far as 'a general rule of thumb' goes, exhaust flow ideally should be 72-75% of the intake runners flow for a given valve lift. If your exhaust port flow numbers are weak, then running a larger exhaust duration/lift to COMPENSATE will improve your power figures over a single pattern cam. 4V Clevelands are a perfect example of this, with the exhausts barely making 55% of the intake flow. 9 port Holden heads are the other way, the exhaust actually outflows the intake at lower lift levels, which is why in the olden days people used to fit 1.6:1 rockers to the intakes on their 186s.

Now in regards to Jeff's engine here I don't see why you would be questioning the result. Just because Joe Dirt Performance in f**k Qld tried an E303 in a 5litre and it was disappointing, doesn't mean that its a bad cam, bad combo or 5 litres can't make low down power. We have a very efficient cylinder head (more efficient the head, the less cam duration you need), a mild camshaft (std 5.0HO cam is 216@0.050", this one is 220@0.050"), match ported intake and an engine builder who puts in the time to make sure every component is exactly spot on. Add to this a reasonable factory ECU (EEC-V) with tuning (TWEECER) and a competent tuner and the result is plain to see.

As I told Jeff yesterday when he came in, with a 347 bottom end his torque figures would have been closer to 370ft/lb at the wheels, and power around the 320rwhp. We've 'been there done that' on many occasions already.

I had a chat to Leon about this as well, his opinion is its due to the speed (or lack thereof) of the EEC-IV ecu, literally it can't see and adjust to what the engine is doing fast enough.