The blow by looked like he had a water leak to me. They mentioned something about epoxy earlier. Chance that is related to the water vapor.
Testing the HiRev 7500
- Thread starter Newbomb Turk
- Start date
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He also mentioned water right at the end. Whatever it was, I don't think it had many pulls left in it.
Mattax
Just the facts, ma'am
I just took a few quick looks at the video. Not seeing any info about the timing other than 35 degrees.
If someone caught a mention of what rpm that was measured, and if anything can be gleaned about hte advance curve, please post up. We can see a vacuum advance on the distributor, so its not a 'tach drive' race unit.
If it was a MP distrributor, and if it was set per the old instructions (Chrysler and early Mallory built era), then 35 should have been set around 2600-2800 rpm. If it was set to the later instructions I've seen posted on line, then around 2400-2600 rpm IIRC.
The higher they set the timing, the less rpm range before hitting peak Hp.
If they set it at an 'all in' around 2000 rpm, with just light springs, then slew would be a bigger influence.
You guys may have noticed I walk away from threads were the guy won't measure rpm when "checking timing". Timing without rpm means nothing. Or close enough to nothing!
If someone caught a mention of what rpm that was measured, and if anything can be gleaned about hte advance curve, please post up. We can see a vacuum advance on the distributor, so its not a 'tach drive' race unit.
If it was a MP distrributor, and if it was set per the old instructions (Chrysler and early Mallory built era), then 35 should have been set around 2600-2800 rpm. If it was set to the later instructions I've seen posted on line, then around 2400-2600 rpm IIRC.
The higher they set the timing, the less rpm range before hitting peak Hp.
If they set it at an 'all in' around 2000 rpm, with just light springs, then slew would be a bigger influence.
You guys may have noticed I walk away from threads were the guy won't measure rpm when "checking timing". Timing without rpm means nothing. Or close enough to nothing!
Watch it again. He says 38 degrees the last time he talks about it. That's with the FBO box.
gzig5
Well-Known Member
I've got an FBO box and coil that I could loan you for testing. It performed better than the parts store OEM style the car came with. I plan on using it when I get the car back together, but it will have more of a challenge with the new motor putting out probably about double what the tired, stock-ish 340 was. I'm interested in finding out how it stacks up.
gzig5
Well-Known Member
I think they did them all at 35 degrees and then for some reason bumped the FBO up to 38 for the second run. Strange they would deviate like that for the FBO and not the others, but I think the 38 degree was the best run of them all.
bee1971
Well-Known Member
Roku
Click ^^^
Or try finding episode S5/E15
Engine Masters - Throwing Sparks
Ignition Systems on a Ford Big Block
They used the Chrysler Orange Box at one point and then a Napa Chrome Box when the Orange Box failed at RPM
If you have time give it a watch - Excellent episode
Click ^^^
Or try finding episode S5/E15
Engine Masters - Throwing Sparks
Ignition Systems on a Ford Big Block
They used the Chrysler Orange Box at one point and then a Napa Chrome Box when the Orange Box failed at RPM
If you have time give it a watch - Excellent episode
Is it the one that’s posted above or the one with the HEI module?
Either way I’ll test it.
What distributor do you use?
Edit: the other thing I’d love to test is these boxes by themselves.
My machine will do it but the issue is the connections to the box from the machine require a 5 pin box.
Everything I’ve tested has been 4 pin.
Maybe I can post the connections up and someone can figure out how to do it without the 5th pin.
Or as the instructions say pin 1. IIRC you have to hook a jumper wire from pin 1 to pin 3. What you’d do if you don’t have pin 1 is what I don’t know.
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Mattax
Just the facts, ma'am
So its locked?
I would sure as HECK hope so.
I didn't get that impression. I think they just bumped it to 38 total.
Mattax
Just the facts, ma'am
Total at 2000 rpm or 4000 rpm?
Without knowing the rpm we can't compare slew effect or even guess at timing the engine saw at peak torque and Hp. Heck they may not have even checked it at the same rpm from run to run. Wing the throttle and call it all in.
Now I never heard that. It didn't seem very scientific. Almost as if it was a commercial for FBO somehow.
Turk,
HEI firing anything of consequence? Does a nitrous powered engine over 800 hp count?
And where is the 2500 hp engine that is fired by a 3 amp mag????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
HEI firing anything of consequence? Does a nitrous powered engine over 800 hp count?
And where is the 2500 hp engine that is fired by a 3 amp mag????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
You've posted that stupid picture several times. Those primary tubes won't support but maybe around 450 HP at the most. You're dreamin.
LOL.....I hope that wasn't in Med School.
The other issue is did it ever make it to the track or is it just another dyno queen?
Since some nice folks won’t question DV I will.
Did they test ANY other ignition against the HEI?
Did he post the plug gap he used on this 500 hp 800 hp engine?
Or do we just take DV at his word? I mean this guy has tested more cams than Warren Johnson and could probably teach WJ a thing or three about Pro Stock engine cam timing.
Try this.
Go to a drag strip running nostalgia fuel Funny Cars.
See what they have for ignition. Take a photo of ANY fuel burner running an HEI.
As I posted above, I’d bet everything a 3 amp mag would make more power on the pretend 800 hp Vizard engine above, but we will never know because DV is a one trick pony.
Fixed.
Dave999
Well-Known Member
Naa don't worry... i scraped through in applied physics.....taught science to kids whose main interest was expensive shades,Dr Dre, and unlaced, fresh outta tha box, training shoes, still with the price tags on.LOL.....I hope that wasn't in Med School.
They often suggested my mother didn't know my father when i was born.... and in a mind boggling range of different languages, i might add
Oh yes, we had some fun
then got a job in IT
(less fun)
D
Naa don't worry... i scraped through in applied physics.....taught science to kids whose main interest was expensive shades,Dr Dre, and unlaced, fresh outta tha box, training shoes, still with the price tags on.
They often suggested my mother didn't know my father when i was born.... and in a mind boggling range of different languages, i might add
Oh yes, we had some fun
then got a job in IT
(less fun)
D
lol classic!!
gzig5
Well-Known Member
I don't know which version it is. I need to look for a receipt but I think I got it 5-6 years ago. It has a rev limiter so I would think it's more than just an HEI block. I did find the instruction sheet from it and it cautioned against testing by a third party, but I think he's just trying to keep people from reverse engineering it and you can't do that through five pin connector. Only four pins are used and the OEM ballast resistor is jumped out. I'll post a pic of the instruction sheet when I get a chance.
I used it with the OEM Chrysler magnetic pickup distributer. Got the FBO plate to play with and was still trying to optimize the mechanical timing when I ran out of time and had to pull the engine to fix the chassis. The plate wasn't accurate for the degrees per slot, but it was a little faster than welding and filing while changing the setup. I was running without vacuum advance, which seemed to make it squirrely. Later figured out that the diaphragm in the vacuum can was leaking, so I need to address that.
gzig5
Well-Known Member
in the late 80's, my friend ran 9.20's @ 150 mph with the mopar performance distributor and I believe the orange box (the real orange box). I learned then that I don't need a 600.00 (or more) dollar system to run 13's... LOL
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