VR-200’s…… AGAIN…….

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PRH said:
Corrections for atmospheric conditions are a necessary evil for dyno testing comparisons.
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True! But it's a eye opener to see a pull with the correction factor just under 1 percent, and then it reset to 10% for the "hero" pull
 
This is another test engine that I built to prove our VR-200 cylinder headsC
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Can you share some head information? I'd like to see the flow numbers at .400", .500", .600" along with the intake valve diameter, throat dia or % and the port length and CC's if possible
 
74 Cuda said:
I'd like to see the flow numbers
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I already asked, I understand why he won't show them, probably doesn't want to get into a flow bench battle with the naysayers.
Some things are better left to themselves when it comes to custom work.
 
I already asked, I understand why he won't show them, probably doesn't want to get into a flow bench battle with the naysayers.
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Some things are better left to themselves when it comes to custom work.
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No arguments here just wanted to crunch some numbers. All good
 
74 Cuda said:
No arguments here just wanted to crunch some numbers. All good
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I’m not sure what the Bloomer brothers would say if you asked them that, but I would say air flow is not at the top of the list of important stuff I look at.

I don’t think airflow is in the top 5 things I worry about.

Shape, shape, shape.
 
The velocity through the curtain area has a major effect on power potential and is also one of the factors used to determine the cam requirements
 
I don't have flow numbers or air speed. But with a Crower 31409 cam and 11.2 compression you can make 680 hp with the Bloomer heads.
 
I believe what I was told is they peak just shy of 300, maybe AT 300 cfm. No idea what lift
 
NC Engine Builder said:
They learned a lot from there first head they offered, the current one is in a whole different league
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Actually Vic is who did this head. He is a friggin genius.
He had nothing to do with the original head.
That port design was outsourced.
THis head was done from scratch by Vic. He worked on it several years, on and off the bench..
I knew when I heard he was doing the head it would be special. You just kinda have to know him..lol. It’s why I invested in a set when almost nothing was known about them at the track yet.
He has a mid 9 sec 596 iron headed, 1.92 valved 20 over stock stroke 340 he plays with when he has time. It’s fun to watch run when he gets it out…he doesn’t baby it.
 
Well there goes the theroy that you can't make power with stock structure heads .
 
74 Cuda said:
The velocity through the curtain area has a major effect on power potential and is also one of the factors used to determine the cam requirements
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That's a good point. Its also were a lot of vaporization of the mixture takes place so there's some interesting dynamics there between piston speed, camshaft lift and valve curtain area.
 
LO23M8B said:
How did you get it so light. Mine weights 3550 without me,
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He didn’t say if his was a notch back or fast back. Maybe his is a notch back and I’m guessing yours is a fastback by the weight, which btw is on the porky side of even a fastback. My 68 fastback is 3440 without me
 
i might have to get a set, i'm planning on putting an R block with a Callies dragonslayer 3.58'' crank together next year. i think these heads with a good sized solid roller would be a decent little engine.
 
LST46 said:
He didn’t say if his was a notch back or fast back. Maybe his is a notch back and I’m guessing yours is a fastback by the weight, which btw is on the porky side of even a fastback. My 68 fastback is 3440 without me
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Mine is a fastback 340/904 with a dana 60 all steel even the bumpers, 6 point cage. It does have S/S front seats and when I weighted it the rear seat was out.
 
Just thinking this over, the only reliable , can't lie is to take a known sorted out, legal race car, like a record setting stock class car, and put those heads on a good shortblock with a great level of prep and let er rip. Then look at weather corrections, tire type, trans, etc . And see just how well the heads do. The problem remains of just how well joe average customer will use those heads though. Case in point. Me. In a course of 24 years, using 440-1 heads, i moved from about 725 hp to 926 hp as i went through different levels of prep and porting, shortblock, compression change, i got more and more out of those original castings. And a good friend is closer to 1,000 hp with the same head. So i get thier reluctance to post anything but track times.
 
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