Don Terrill’s Speed-Talk

I don’t know how anyone can look at that graph and think “this is a good test, let me put it on Youtube”. Its the ongoing quest for relevancy that drives it! :D I’d like to think in 2024 we’d still have good content being made and shared, but this is all that seems to be left in the dust of the int...

Eroy wrote: ↑Wed Apr 24, 2024 11:31 am

mt-engines wrote: ↑Wed Apr 24, 2024 11:24 am Either way.. port energy is some MADE UP BS to sell a BS computer program to chose a cam with an arbitrary lobe center.

Would you expect anything else from that camp?

I don’t know how anyone can look at that graph and think “this is a good test, let me put it on Youtube”.

Based on the flow curve and cross sectional areas, im not convinced the heads fit the engine well. WAG; Maybe the air flows through the valve throat in such a way that it blocks the flow zone, reduces the available area and chokes the engine? :-k -juhana If you work on a rules restricted engine, th...

DD49CF24-2C89-4064-9210-6E069EA0604A.png Something seems wonky here. I’ve never see an engine fall off dramatically and level off like that without something being wrong. If the air is reaching a critical velocity from being undersized, it will start falling off and remain falling off. Are they sur...

Richard Holdener doesn't have an opinion, he has a dyno. The 2.165/1.590-inch valve combo in this lsa test also responded favourably power wise to a 108* lsa https://www.motortrend.com/how-to/1506-lobe-separation-angle-explained-and-how-it-affects-horsepower/ It’s a wide open throttle dyno test fro...

Not saying DV did this but chassis dynos are extremely easy to manipulate. Years ago back when the Fox body Mustangs were all the rage and chassis dynos were relatively "new" there was a guy in New Jersey who had one in his Shop. He was in the Mustang magazines all the time. His business ...

Aaron Kelly is getting about 185bhp from a full prep, SCCA GT spec A13. Mike Jones does cams for Aaron as well.

The R16 has to have a SIR, correct? Unless you’re doing vintage now.

....on the upside tho, apparently Rebello in California is getting 180 - 185+ hp from these engines at 6500-6800 rpm, so....there is that. A 150 HP engine on Rebello's dyno would show 200+ HP . You can't believe anything they state as to HP. It's all marketing. They were claiming an L6 engine combo...

Higher comp [within reason] will give greater power/efficiency for a given capacity at full throttle. At part throttle higher comp is not really playing a part here as we are not filling the cylinder with fuel air mixture, burn efficiency is at play here, chamber design, an active charge and fuel/i...

Odd ball package Class racing Something really weirdly specific (power wise, or just want to spend the money) You V8 guys have some wonderful stuff available to you OTS that if you’re not limited by rules or availability, makes almost no sense to go custom. FYI: I consider CNC packages from people l...

:twisted: Possible. It won some events in one of Paul Gentilozzi's cars. It has been fun to disassemble. Would love to know what the build sheet / cam specs look like for one of those of that era. Warp, you ever get to play with these cars? I'll see if I can't get around to putting the degree wheel ...

cab0154 wrote: ↑Mon Mar 25, 2024 3:09 pm Possible. It won some events in one of Paul Gentilozzi's cars. It has been fun to disassemble.

Would love to know what the build sheet / cam specs look like for one of those of that era.

Warp, you ever get to play with these cars?

those cars were 80" wide with 28" of rubber on the rear....lol. there was some lateral Gs. We are putting together our own fox body tube chassis trans am car to go vintage race. most of those guys with their sn bodied cars are running 400" windsors. we are gonna run the c3 headed 308...

Buying electronics, I’ve always bought refurbs direct from the manufacturer. Usually you end up with something that is very low use, and has been gone through better than from the factory floor for much cheaper.

Depending on how Holley does the refurbs (in house?), it may be the same.

from a $60k winning scca 308" sbf trans am engine build from the late 90s. Figure near 2 lateral g’s, even in the late 90s, with spikes over that from hitting curbs. Part throttle to feeding in throttle at that time as well. Also, most US road courses are clockwise, so usually more right hand ...