Gary Hart's 1951 GMC Half Ton - now with Teaser video!

[dieselgeek]

Re: Gary Hart's 1951 GMC Half Ton

On the inliners forum, a gut there with an EFI'd turbo chevy 250 ran into issues with afr's and fuel distribution with the shared ports (lump ports). He went to an individual runner head and it cleaned it up. I wonder how the sequential will work with the shared ports.

It's said that sequential injection is the only proper way to do shared port EFI. That's how the guys with the Salt Cat did it on their shared port XXO engine (inline 8 buick like Dr. Mike's) and they had a lot fewer problems than we had on the #1950 Buick, same engine.

The idea is to inject the fuel in the column of air that's headed for a specific cylinder, and not to overlap them. The salt cat guys said it was super easy to set up and gave them no problems at all. Versus what we went through on the #1950 - different sized injectors, 12 of them? spraying all over trying to optimize distribution, which was only good at WOT. We'd have put ms3x on the buick if it had been available at the time, I think. May still try that in the future.

[Huskinhano]

Re: Gary Hart's 1951 GMC Half Ton

One question about the EFI. How do you handle the injectors and firing them with just 3 intake ports. Are you planning to run 3 injectors doing double duty? Love the engine turned plate that the coil packs are mounted on.

great question. Shared intake ports and port EFI can be a huge pain in the butt. He's running six injectors, which will be fired in groups of three (2 banks of injectors). If distribution becomes a problem, we'll fire them sequentially (using the MS3x CPU upgrade), timing the injector opening with the corresponding intake valve opening. Upgrading from his MS2 to MS3x is a few extra bucks and hour or two of wiring. We'd need a cam speed sensor, which is easy to do inside the old distributor with a pertronix module, or even points.

For starters, we're going to see how it does on bank fire injection first. With the injectors a little bit upstream, I don't expect us to need the sequential.

I was going to ask if you were going to run 6 injectors but I thought there wouldn't be enough room. I find this a real inrtersting post. So what's up with the 50 Buick? Any progress you can post on that?

[DanStokes]

Re: Gary Hart's 1951 GMC Half Ton

Scott - I'll demonstrate my ignorance and ask the Dumb Guy question - Why not TBI? Is fuel distribution the issue? Seems like with that log manifold that the mixture would be pretty homogenous, especially under pressure. Maybe not - I don't know. That's why we have you in the world.

So, what's the pros and cons?

Dan

[dieselgeek]

Re: Gary Hart's 1951 GMC Half Ton

Scott - I'll demonstrate my ignorance and ask the Dumb Guy question - Why not TBI? Is fuel distribution the issue? Seems like with that log manifold that the mixture would be pretty homogenous, especially under pressure. Maybe not - I don't know. That's why we have you in the world.

So, what's the pros and cons?

Dan

We considered that, but using anybody's OEM TBI unit would probably not meet the fuel demands of the turbo setup. (Some will argue this, I know). Anyways, injecting upstream similar to what they did on the Spectre Maverick *IS* a good way to do it IMO. just not using an OEM TBI, but still adding the fuel well upstream and running a wet manifold.

It may end up that way, who knows. Gary welded stainless for a living - he can fab this stuff up in his sleep. He uses one of those old school scratch-start welders too. Very cool.

[SuperBuickGuy]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

[dieselgeek]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

Yep, sure do!! Have met him a couple times.

[dieselgeek]

Re: Gary Hart's 1951 GMC Half Ton

While we've all been on the internet, someone's been doing real work this weekend!

[Brian Lohnes]

Re: Gary Hart's 1951 GMC Half Ton

Man, this is so friggin' cool.

[squirrel]

Re: Gary Hart's 1951 GMC Half Ton

trailer springs on the rear?

[SuperBuickGuy]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

Yep, sure do!! Have met him a couple times.

he and my dad went to high school together, raced, and still talk... it's a small world.

[Scott Liggett]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

Yep, sure do!! Have met him a couple times.

No relation to Scott Liggett. Me. Unless I got a second cousin somewhere Mom forgot to tell me about.

[SuperBuickGuy]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

Yep, sure do!! Have met him a couple times.

No relation to Scott Liggett. Me. Unless I got a second cousin somewhere Mom forgot to tell me about.

they were from the approximate area where you currently live - so perhaps there are many skeletons to be found ;D

[Scott Liggett]

Re: Gary Hart's 1951 GMC Half Ton

Scott, you mentioned a LSR 50 Buick... out of complete and idle curiosity, do you know Les Liggett?

Yep, sure do!! Have met him a couple times.

No relation to Scott Liggett. Me. Unless I got a second cousin somewhere Mom forgot to tell me about.

they were from the approximate area where you currently live - so perhaps there are many skeletons to be found ;D

Well, there is another Scott Liggett who is a composer for commercials and TV shows. Then there's a third who is supposedly a porn producer whom I'd like take over his life.

[GH]

Re: Gary Hart's 1951 GMC Half Ton

Squirrel, once again you gotta good eye. Yes, those are trailer springs, both front and rear. New replacement springs were going to cost about $350 per pair. These were a lot less, I have an account at Redneck Trailers, which includes a good discount. I used trailer springs on both the Willys and the Stude on the front end. Lester Leggit visited with us at Speedweek a couple of times last year. He is building a Studebaker, I'm sure it will have a killer Hemi in it.

[HillbillySailor]

Re: Gary Hart's 1951 GMC Half Ton

Squirrel, once again you gotta good eye. Yes, those are trailer springs, both front and rear. New replacement springs were going to cost about $350 per pair. These were a lot less, I have an account at Redneck Trailers, which includes a good discount. I used trailer springs on both the Willys and the Stude on the front end. Lester Leggit visited with us at Speedweek a couple of times last year. He is building a Studebaker, I'm sure it will have a killer Hemi in it.

Interesting solution to an expensive problem! How do they ride with those trailer springs??