OST-028: Redline it baby....

[oldeskewltoy]

from another forum Wrote:Looks perty.

The head had serious work done before pressure checking? Or is this a post work extra check? I also consider pen-dye worthwhile in addition. You have opinion on it?

Can't wait to see what the performance looks like.

The client said the person he bought it from had cleaned and pressure checked it. It is clean, but for some reason **IF** it wasn't pressure checked $1000 worth of porting will be for naught... so for $60 we had it re-checked.

same poster as above Wrote:As this is similar to my build, I'd guess peak torque is closer to 6200rpm. I imagine a fully optimized motor with OS valves running the poncams could come in around 180+hp crank, and on that alone TVIS delete is probably a good call.

I wanna disable my TVIS soon enough to compare low end response.

thank you for that.... The Tomei Poncam dyno shows peak @ 6000, it also shows that the peak is preceded by the climb to the peak 500 rpm early... @ 5500.

My purpose for trying to get the intake length a bit longer is to attempt to aid the torque rise... and in so doing offer the client a very strong mid range to peak rpm powerband.

Your intake length is closer to 17.5" (4.1head + .9TVIS + 12.5intake manifold to plenum) @ what rpm point does that length favor??

Just doing a quick bit of basic math shows 17.5" is not a clean equation for an intake pulse @ 5500. 17.5 does not divide 93 without a remainder, it does divide cleanly by 87.5, or 105

Maybe we can get one of our other math wizards to give us the rpm levels those 2 numbers calculate out too......