Don Terrill’s Speed-Talk

Glad Keith touched on the cooling systems on the new engines. That is the biggest advantage over the last generation of engines. The manufacturers knew NASCAR would not allow any large power gains, so they designed the engines to need less radiator. That's worth more speed than all the other improve...

Stan Weiss wrote: ↑Thu Sep 21, 2023 11:33 am I must have missed the memo. What does LSA have to do with Cranking pressure?

Nothing, yet at least twice a week, I get guys telling me they want their cam on a 108 LSA, so it'll have more cylinder pressure.

SpeierRacingHeads wrote: ↑Thu Sep 21, 2023 11:01 am Cranking pressure went up.

Cranking pressure went up, with a wider LSA? Impossible

Orr89rocz wrote: ↑Fri Sep 15, 2023 10:49 am Who makes retainers for psi springs? Their website didnt seem to have anything listed

We do, and there are others.

Assuming average valve weights, and moderate cam acceleration rates, I would go with a dual endurance spring like the Isky #9995 made by PSI, or the PSI CT-1539-ML installed at 1.950"

No need to get exotic with only .730" lift, and 7,500rpm

Robban 54 wrote: ↑Wed Sep 13, 2023 11:13 am These springs were bought and fitted 5 years ago.

Their issues have been going on for a lot longer than 5 years.

In the past, Comp would work with reputable vendors on items like valve springs, Lifters, and rockers, then they started having those products copied and made somewhere else, to increase profits. I would not use anything they sell.

skinny z wrote: ↑Mon Sep 11, 2023 1:29 pm

Tom Walker wrote: ↑Mon Sep 11, 2023 1:05 pm One of my posts was deleted...

Mine as well. And I can't say I understand why.
Not that it matters really.
Still following Chad's progress with interest.

If someone's post goes against community standards, it gets removed.
If you quote that post, in your response, your post gets removed.

With all that gets said on here at times, what I said needs to be taken down? I never attacked anyone personally and only expressed a desire for all of us participants to respect each other and treat each other with respect. I truly value this forum and what it has to offer, but altering a post wit...

SpeierRacingHeads wrote: ↑Wed Sep 06, 2023 11:42 am
.165 wall 7/16 pushtubes

Your cam designer appreciates that.

I have not seen or heard anything.

Erland Cox wrote: ↑Fri Sep 01, 2023 5:34 am The different duration and lobe separation is because of less camshaft flex?

Erland

Cam flex has an effect on duration, but not lobe separation.

Thanks.
The cam just lets the engine take advantage of your ports.

Oddly enough I believe at least 4 EMC Winning engines fit the 128 profile... That is 100% meaningless. The winning EMC cams were not chosen because of "128". "128" was not used in their design. How many EMC winners don't fit the "128" rule of thumb? If I came up with a...

I you are putting the indicator right on the lifter, it doesn't need to be a mechanical lifter. If you can't reach the lifter with the indicator, find a gauge pin that fits inside the I.D. at the top of the lifter(around 1.680") and set in inside, resting on the wire clip that holds the plunger...