Don Terrill’s Speed-Talk

I believe that it is a lack of detergents. Is there a detergent additive that won't blow up the oil's film strength performance like the ZDDP additives do? 4. 10W30 Lucas Racing Only synthetic = 106,505 psi zinc = 2642 ppm phos = 3489 ppm moly = 1764 ppm NOTE: This oil is suitable for short term ra...

4. 10W30 Lucas Racing Only synthetic = 106,505 psi zinc = 2642 ppm phos = 3489 ppm moly = 1764 ppm NOTE: This oil is suitable for short term racing use only, and is not suitable for street use. 7. 10W30 Valvoline NSL (Not Street Legal) Conventional Racing Oil = 103,846 psi zinc = 1669 ppm phos = 15...

Why have such a sharp turn? Why transition to round? If you're 3D printing parts there's no reason to go to round. As others have said a taper is nice here, but one thing that works extremely well is having an elliptical shape at the runner entry that protrudes into the plenum box. So you don't jus...

You went taller than you previous revs. In theory, you can make your runners tapered and then put the throttle wherever you can package it. Any throttle per cylinder system is going to have better response than any throttled plenum manifold, but the best response comes from keeping the throttles as ...

Your results may vary, but if one has to ask "anyone done it before? got any pointers?" chances of success don't seem likely. One of my favorite responses to crazy ideas on car forums comes from this... "If you think you can do it, you don't need the internet to tell you how". W...

I've heard of both mounting BMW 24V I6 heads on a BMW V12 block as well as mounting 24V Jaguar heads on a Jaguar V12 block.

As Porsche demonstrated with the M96/M97 and incessant IMS bearing failures, using the same head on both sides of a DOHC engine results in some monkey motion of the timing drive

You'll want area taper and to bring them to a common plane for manufacturability. The runners should intersect the common plane perpendicular. Caddy Northstar runners intersect the manifold mounting plane at an angle, yet people have still tried to mount induction perpendicular to the plane... with ...

Your results may vary, but if one has to ask "anyone done it before? got any pointers?" chances of success don't seem likely. One of my favorite responses to crazy ideas on car forums comes from this... "If you think you can do it, you don't need the internet to tell you how". W...

I've seen a couple of these done, and was thinking about one day, doing it myself. with two V6's for a 7-ish liter V12 the hard part I see, is welding the heads and blocks together lots of preheat and jigging, obviously you'll need cams ground and a crank made, engine management could also get a li...

Jagdpanzer wrote: ↑Thu Feb 06, 2020 10:48 am Check with Lloyd at Springfield Custom Auto Machining.
He does crank polishing and surly knows of the local nitriding sources.
http://www.customautomachine.com/

Wow, that one's actually close! Thanks!

LoganD wrote: ↑Wed Feb 05, 2020 9:36 am If you want US based, Moldex and Kellogg are no question the best for nitriding depth. I've had Moldex do 1mm depth.

Fancy meeting you here.

Aren't currently, there are two distinct Nitride processes, one being plasma (?), and not often offered by same vendor, and both have their own attributes? So that should be it seems a decision first made? It's a ready to install crank and I don't want to incur a bearing turn on it if avoidable. I ...

Back from the dead threadsurrection!

I'm looking for a place to nitride and micro-polish the factory forged crankshaft from the '06-'09 4.4 liter supercharged Cadillac Northstar.
I'm in VA and can ship to the Detroit area, but it would be great to find somewhere more local.

I'd call this place first. They have some nice equipment, including a Kodak optical comparator so I would assume they had a profilometer. Never hurts to call and ask. http://www.profilemachineworks.com/ Thanks! I emailed them to see if they do engine work. There are lots of job-shops that can do ae...

The bore is out from the stock 3.662 to 3.670. Total Seal has a set at 3.682, so I think that's my next size. First of all are you sure that the problem is not partially if not entirely because the cylinders are .008" oversize now " The stock bore is 93mm which is 3.6614" Unless you ...