Don Terrill’s Speed-Talk

jed wrote: ↑

Sun Aug 02, 2020 5:21 pm

I was thinking the same thing. Large intake ports and valves would work good at Bonneville but not so well on a short
track engine.

I would agree normally but I only have data on large flatheads, 315 ci or more. Nowdays 321. It works.

I often wonder why H-D when they had an almost unlimited development budget, didn't think about bigger ports and valves. While bigger is sometimes slower flow with N/A, on a flathead Ford it means more hp if the volume goes up. We did flow testing back in the late 50's with ports enlarged by welding...

XF/FMR to run at Bonneville.

I know about the NOS French flatheads but still.. pdq67 There's a US company that makes blocks. Edelbrock and Offenhauser make heads. You can buy every part, brand new, made in America Most vintage racing associations will not allow after market or French blocks. Mods to an OEM block are unlimited ...

In 1956 when we were developing the Allison race cams we set up a head with one cylinder’s valve assembly in it with a variable speed motor to drive the cam. We ran it up to operating rpm range and stopped motion with a strobe-o-tach. We then photographed the assembly with a macro lens equipped came...

"nothing ever made power above 5500 until 1972"

Oh???

Public service announcement. A glass of wine To my friends who enjoy a glass of wine, and, those who don't and are always seen with a bottle of water in their hand: As Ben Franklin said: "In wine there is wisdom, in beer there is freedom, in water there is bacteria. In a number of carefully controll...

Speaking of valve springs, did anyone here ever see a set of Isky SBC desmo heads when they were available?

"5 + 5 = 10 grams. 50% of weight for reciprocating is 5 grams." Roger on that. After 4 martoonies, thingz get off a bit. For vintage circle track engines, we go for as light a bob weight as we can get. I have taken more than that off of forged pistons many times. From just looking at the picture, I ...

Get the lighter pins. The rest can be easily taken out of the pistons.You will need a mill for that.
If you can hit the old weight within 5 grams, (10 on bob weight) it will run with no problem.

The GOV did do it. The GOV mandated catalytic converters and the zinc kills them. There isn't one single moron in the government with the brains to pour piss out of a boot, with instructions on the heel and yet they want to tell automakers and everyone how build what they build. The government IS t...

Pete any experience with raiseing the intake seat and or lowering the exhaust seat. Do you find much reversion On long duration camshafts? And if so how do you deal with it? > No, on raising or lowering seats. It is something to fiddle with though. I run reversion dams in the exhaust. With the inta...

How popular is Pro-V?

What a crock. For a certain price they will do a half ass job and for another $125 they will do it better. Notice I said "better" not right.
A company that does it that way is most likely not capable of doing it right.

<r><QUOTE author="motormonkey" post_id="826353" time="1568073383" user_id="743"><s>[quote=motormonkey post_id=826353 time=1568073383 user_id=743]</s> Pete1. Can you share the max rpm your making power at. Also are you running the French blocks or ford blocks. <e>[/quote]</e></QUOTE> The cam will det...