XXO/BVGC '38 Chevy Coupe Build

[ronnieroadster]

I say 650 HP! 

Tman was right on the money. All the work is paying off but I'm wondering if Dale ever sleeps?
Congratulations to everyone involved.

[Peter Jack]

WELL done Guys! 

Pete

[BoredAndStroked]

All the work is paying off but I'm wondering if Dale ever sleeps?

Hey Ronnie . . . good observation . . . not much these days!   I'm planning on wearing out, before I rust out!

Looking forward to seeing you at the Ohio Mile in early May. 

B&S

[Jack Gifford]

Oh my... do ya' s'pose the designers of that engine (in 1936 or so?) could ever imagine it surviving 700 ft.lb. of stress? Remind me again, how the bottom end differs from original: How many mains now? Anything like a mains girdle? Custom steel crank?

[BoredAndStroked]

Here is a link to the dyno screen - hard to see, but what the heck:

https://www.youtube.com/watch?v=LigLEXjme2s

[SPARKY]

Are you guys holding out on us 

[38flattie]

I've been busy, and haven't been on the board for a while, and have a lot of catching up tp do!

FIrst, I want to thank everyone for all of your support! It means a LOT to us!

Overdue, I respect your opinions, and hope you follow our thread.

Jack, the engine has 3 mains, and a custom billet crank, and a massive crank girdle.

Sparky, I wish we were holding out, but we aren't-I think without major changes, we are at the max for this engine/cam combo!

We ran on alky, up to 19.4 lbs boost, then added 10% nitro, and 2 more lbs boost.We only gained 13 HP, but a lot of torque. See pics-first pic is the alky tune we will run. Second pic is our nitro run. We'll run the nitro if we end up a couple of MPH short-kind of our 'Hail Mary' tune!

I was disappointed, as I really thought we could and would top 700 HP. Still, the engine makes great torque, so we'll see what happens on the salt.

Lastly, to Buickguy 3: Doug, I'm glad you are bring the Jag back! Salt Cat is the team that inspires and drives me the most, so we look forward to pitting next to you in impound. This time, though, we may both be there on the same record!

[Tman]

I say 650 HP! 

Tman was right on the money. All the work is paying off but I'm wondering if Dale ever sleeps?
Congratulations to everyone involved.

[Milwaukee Midget]

Buddy, don't be disappointed - those are excellent numbers.

707 ft. lbs?  No shame there.  Fat and flat, too.

I think you're just looking at a maximized, port restricted situation.  If the heads/intakes/exhaust were capable of flowing better, it would certainly rev freer, and you'd see more HP.  But the problem then would become the limits of the bottom end.

Maybe the engine's self preservation instincts are kicking in? 

You're ahead - I'd bolt it in the car, and make sure you're carrying enough fuel to make it all the way down the track.



Chris

[Sumner]

....I was disappointed, as I really thought we could and would top 700 HP. Still, the engine makes great torque, so we'll see what happens on the salt...

I sure wouldn't be disappointed  .  Those torque numbers might just get the job done.

I'd be interested in looking at your gearing.  If you want to share post it here or PM me.  Tire size, rear gear and transmission gear ratios.  I think you have a quickchange, what ratios do you have to use?

I'd look for the optimum gearing for 203-206 mph for what you are trying to accomplish,

Sum

[38flattie]

Trent- it's easy to guess the number when Carl told you what it was!

Chris, Randy, Don and I installed the engine in the car before we left California.

Sumner, gearing may be where I'm screwing up. So, I'll give you the info, and maybe someone will point out what I need to do differently

The car has 29" tires, and the Rankin 4 speed gearing is 1.79, 1.45, 1.13, 1.00 (1st to 4th)

At El Mirage, we'll run on an 185 MPH min. I plan on 2.84 gears, and leaving 400 lbs ballast out of the rear

At Bonneville, I plan on 2.54 gears for our 200 mph run.

So, there is a lot of experience on this board running both venues-where should my gearing be??

[Rex Schimmer]

Buddy,
Mighty impressive numbers for a motor that is older than me!!! When you ran the 10% "pop" did you do any thing to the timing?

That big torque should be just what you need at El Mo, it should really help maximize your acceleration that is if you have enough traction, better keep some of that ballast handy. Where as at Bonneville it ain't the torque that makes you go fast it is the horsepower. Once you are pushing on the "aero wall" at close to max speed it is horse power that makes it happen. Torque just makes it easy to drive.

Rex

[Sumner]

.... Where as at Bonneville it ain't the torque that makes you go fast it is the horsepower. Once you are pushing on the "aero wall" at close to max speed it is horse power that makes it happen. Torque just makes it easy to drive.

Rex

I might have to say normally that might be the case but not necessarily always.  I remember an interview Jack C. gave once.  I'll get the exact wording wrong but he said he wanted a motor that was kind of like a truck motor that could pull a big hill.  I think that if Buddy can get his gearing right the torque can get it done in his case.  He is pushing a brick up a big hill. 

For a NA motor I'd take the higher rpm HP,

Sum

[Sumner]

...The car has 29" tires, and the Rankin 4 speed gearing is 1.79, 1.45, 1.13, 1.00 (1st to 4th)

At El Mirage, we'll run on an 185 MPH min. I plan on 2.84 gears, and leaving 400 lbs ballast out of the rear....

Is your redline going to be the 5500 that is on the dyno sheets?  If so unless I screwed up the 2.84 would be 167 at 5500.  6000 would be 182.

...The car has 29" tires, and the Rankin 4 speed gearing is 1.79, 1.45, 1.13, 1.00 (1st to 4th)

At Bonneville, I plan on 2.54 gears for our 200 mph run....

With the 2.54 gears 5500 is 187 and 6000 is 203.

With 2.47 gears 5500 is 192.  

With 2.41's 5500 is 197.  200 is 5590 and 205 is 5729.

With the 2.41's shifting at 5500 would you'd be about 109 in 1st dropping to  4458 on the shift so right about your torque peak.  Second at 5500 would be about 136 dropping to about 4300 in 3rd (still good).  And 5500 in 3rd would be about 174 dropping to about 4800 in 4th.  Nice gears in that transmission for what you are doing,

Sumner

[38flattie]

Sum, Your math matches mine! I figure we'll be spinning 6087 RPM at 185 with no tire spin. We've spun over 6200 in Ohio, so we'll go with that at El Mirage. I think with the short run, we'll need to keep this thing running hard.

We may drop down from 2.54 on the salt, to 2.40. In the past, I've been over optimistic on how tall a gear the car would pull-I don't want to make that mistake again.