421 cube pulling truck engine

[Carnut1]

No doubt two great running trucks. Both have frames bent!

[zums]

Nice, Miller Time!, hey, why dont you just run 87 octane like the other engine thread, just wear a suit of armor when you are filming
Tom

[Old School]

I would like to see the engine on your brother's dragster and get some numbers.

4.99 in the 1/8 mile ?

Randy

It will be quicker than that. I guessed at the dragster weight, 1600 with driver, and the engine losing about 40 horsepower from the dyno peak and got high 4.80's. If the car is heavier, the converter too tight, rear tires too big, then adjust upward accordingly. A converter that would get it in the power band and keep it within 600 rpm at shift, then run it out the back door would be the fastest. Be fun to try but too expensive to optomize. Fun playing what if anyway.

Billy

[Old School]

Here's a video of the second place truck.
It's Boone's 469 cube BBC.

https://www.youtube.com/watch?v=JYkIJVv-lGc

He needed a higher gear. Had 8600 rev limit in it, and it was hittin it mid track. Not sure we should spin a steel valve 4" stroke BBC much higher.


Randy

Is this the oval port engine you mentioned building with the 2.17 intake valve?

Billy

[randy331]

Here's a video of the second place truck.
It's Boone's 469 cube BBC.

https://www.youtube.com/watch?v=JYkIJVv-lGc

He needed a higher gear. Had 8600 rev limit in it, and it was hittin it mid track. Not sure we should spin a steel valve 4" stroke BBC much higher.


Randy

Is this the oval port engine you mentioned building with the 2.17 intake valve?

Billy

Yes, that's the one. He doesn't normally tow to the IAMO pulls with us. Too far for him. This was a Northwest Mo pullers ass. pull. That's who he pulls with mostly.

Randy

[randy331]

I would like to see the engine on your brother's dragster and get some numbers.

4.99 in the 1/8 mile ?

Randy

It will be quicker than that. I guessed at the dragster weight, 1600 with driver, and the engine losing about 40 horsepower from the dyno peak and got high 4.80's. If the car is heavier, the converter too tight, rear tires too big, then adjust upward accordingly. A converter that would get it in the power band and keep it within 600 rpm at shift, then run it out the back door would be the fastest. Be fun to try but too expensive to optomize. Fun playing what if anyway.

Billy

I think his dragster is close to 1800 with him in it. It'd be heavier than that with the 421 in it. 421 has iron heads. Shp pro vs his Bowtie probably be a wash on weight.

I got a good Coan converter that stalled 6200-6300 behind my 383. The 421 is up 40-50 LBs of Tq so it should go on up some.
Be fun to try it out. Not too sure Rick would want to 1/4 mile it out.
It RPMs out good in the pulling truck, be interesting how it RPMed in his dragster.

My Nova be hand full with the 421 in it.

Randy

[randy331]

Get some headers and strap that thing back on the dyno!

What else would you try ?

It needs a bigger carb. Probably be some power in a different oil pan.
Welding the ex port floor may help?
May be able to improve the induction tract some?

Different cam ?
How much power could you possibly end up with on this combo?


Austin wants me to sell the 421 and start on a new 14* pro action headed engine for 2020. He seems to have an rpm addiction.
We already run more rpm than anyone else in our class, but he wants more rpm. LOL
Says we need to turn it over 10000 rpm every pull, but we need to do it on my budget.
I suggested a 4.560 ish bore x 3.625 stroke big block. He said fine, but I'd have to find another truck to put it in.

He has his chassis sold if he wants to sell it, and he wants to come out in 2020 with a new truck and engine.

One guy asked him about the 421. Said they wanted to step their game up next year. They shit at the price he told them.
They were 97' behind our truck at the Grant City pull. He's spinning a 40 to 1 final to 6200-6300 rpm, we're spinning a 27 to 1 final to over 9000 rpm with a much better weight split. Some think they can make that all up with a Jasper engine with a cam. headers and an intake.

In general, we can run in front of the NW trucks, and we've been in front of every IAMO truck at one time or another, but there is 2-3 IAMO trucks that, on average, are better trucks than ours. So, if we want more wins, we need to step the game up too.
IAMO trucks are better trucks, that's why I want to pull with them.

It's tough getting those last few feet. 10' don't sound like much, but it's a mile in truck pullin.


Anyway, just rambling a little this morning. Guess I'll go grind some rings for this BBC pullin truck engine I'm doin.

Randy

[CGT]

What else would you try ?

1.75-2" with a merge...25 inches....just a wild guess.

I suppose their is no reason to spend a bunch of money on headers if the combination will get changed though. A bigger carburetor would be a purchase that is at least transferrable to next season, or other things.

I like the pro action ideal, smaller cube Big blocks 473" just get gross to try and get compression etc...... and I also would be reluctant to make real crazy changes to the valvetrain you have now, seems to be doing its job very well.

[randy331]

smaller cube Big blocks 473" just get gross to try and get compression etc..

Yea, you got to have everything in chamber crashing into everything else to get any comp.
Boone's is just over 12-1 with a 50cc dome and the heads milled .020".
He's wantin some up grades over the winter. New Dart block, new intake, back to the dyno to look for some more power.
I may tighten things up in the chamber too.
Trying to get him to go with Ti intake valve so I can put a faster lobe on the intake.

There's a couple trucks in the works for next year that will run NWMO in his class. He's gonna need to turn a faster gear to just as much rpm to stay up front.

SN dyno flowz ?

Randy

[CGT]

SN dyno flowz ?

SN is ready to go, ready to hopefully graduate from special classes . I'll probably wait until truck pulling is over for you.

[Frankshaft]

Here's a video of the second place truck.
It's Boone's 469 cube BBC.

https://www.youtube.com/watch?v=JYkIJVv-lGc

He needed a higher gear. Had 8600 rev limit in it, and it was hittin it mid track. Not sure we should spin a steel valve 4" stroke BBC much higher.


Randy

Is this the oval port engine you mentioned building with the 2.17 intake valve?

Billy

Yes, that's the one. He doesn't normally tow to the IAMO pulls with us. Too far for him. This was a Northwest Mo pullers ass. pull. That's who he pulls with mostly.

Randy

That's irony. A puller won't pull to a pull to pull.

[slo-svt]

Edit, not sure that link to the engine posted for sale would seem as mean tied to a sled. Bet that sled would seem a lot heavier with that engine in our pullin truck.

Randy

Randy
I suspect you are correct. I plotted the numbers for that engine in excel. The brake spefics are incredible. Far better than the stuff I have been around. I actually went as far as to plot the brake specifics from what i consider a really efficient street engine (1.7hp/cube) sub 7500 rpm engine and figured power backwards. It's about 100hp different than the sheet he posted.

[randy331]

I think we'll keep burning Q16 the rest of the year.

Randy

[zums]

I think we'll keep burning Q16 the rest of the year.

Randy

So how dose the other 421 make the same HP on 87,, couldnt be propaganda bullshit could it????
Tom

[GARY C]

I think we'll keep burning Q16 the rest of the year.

Randy

So how dose the other 421 make the same HP on 87,, couldnt be propaganda bullshit could it????
Tom

The other is a 427 and is 55 horse down compared to Randy's, my guess is if Randy had another dyno session for carb and header testing he would widen that gap even more.