Lightning or GiL
#21
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iTrader: (3)
I've got hours worth of BBC exhaust reading material here in quite a few books. I'd rather not regurgitate any of that info, I'm already known as the regurgitating googler.
But hey, check out this exhaust test from 1964 from Chevrolet Engineering Dept. Wonder if that had anything to do with the 427 Corvette exhaust setups.
Crap, here we go with the sideways pics again
But hey, check out this exhaust test from 1964 from Chevrolet Engineering Dept. Wonder if that had anything to do with the 427 Corvette exhaust setups.
Crap, here we go with the sideways pics again
Last edited by MILD THUNDER; 09-12-2016 at 07:09 PM.
#22
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So, even though max peak power doesn't change much, most of the curve can shift power upwards big time. One of the CMI's in Mild Thunder's pdf shows a lot more middle power than the others....I'm willing to bet this had a better sized 'collector.'
Now, staying on this, PapaSmurf had Diamond Performance's KE exhaust, and he was able to get his collector length to within a smidge of a best length and it fixed his reversion. KE's use a relatively short pipe connected to the manifold compared to many others,
I'll try to find the page,
Last edited by SB; 09-12-2016 at 07:18 PM.
#23
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He was killing 02's due to water..ie: reversion.
Okay,here:
http://www.offshoreonly.com/forums/f...epowering.html
and will quote it below:
Okay,here:
http://www.offshoreonly.com/forums/f...epowering.html
and will quote it below:
Greetings Formula Brothers !
One quick lesson I learned about repowering my Formula, that I wanted to share.
If you are installing a "performance engine with O2 sensor " in a Formula with a swim platform, make sure your exhaust tails are 4 to 6" out past the transom. Myself, and a few others I know have had a unexplained vortex backdraft when using the short 2" tails we like to run sometime
Just food for thought
One quick lesson I learned about repowering my Formula, that I wanted to share.
If you are installing a "performance engine with O2 sensor " in a Formula with a swim platform, make sure your exhaust tails are 4 to 6" out past the transom. Myself, and a few others I know have had a unexplained vortex backdraft when using the short 2" tails we like to run sometime
Just food for thought
3rd Harmonic = 38.8 inches long ... more bottom-end Torque
4th Harmonic = 19.4 inches long ... highly recommended , best Torque Curve
5th Harmonic = 9.7 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 4.9 inches long ... reduced Torque , not recommended
Tuned Lengths= 19.4 best and also 9.7 or 38.8
Look like you are good now !
4th Harmonic = 19.4 inches long ... highly recommended , best Torque Curve
5th Harmonic = 9.7 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 4.9 inches long ... reduced Torque , not recommended
Tuned Lengths= 19.4 best and also 9.7 or 38.8
Look like you are good now !
#24
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iTrader: (7)
Good find SB. I hope endeavor32 is reading this thread and or knows about the formula swim platform. He's been battling some brother sister issues with the engines in his formula. I would imagine he's read the thread but I've been wanting him to yank his swim platform off and leave it off for two years now so I can get a grin while he leaves dock and I'm working. What can I say it's much more entertaining than dealing with the public.
#25
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Good find SB. I hope endeavor32 is reading this thread and or knows about the formula swim platform. He's been battling some brother sister issues with the engines in his formula. I would imagine he's read the thread but I've been wanting him to yank his swim platform off and leave it off for two years now so I can get a grin while he leaves dock and I'm working. What can I say it's much more entertaining than dealing with the public.
You know what is better than hearing me at the golf course? Doing circles around me with your boat! Getrdunn!
#29
I am assuming that they are testing the powerflow plus model ? which is right there with the KE price wise. Imco offers three different risers for these
http://www.imcomarine.com/cal_store/...-polished.html
It would be nice to see a updated test of exhaust manifolds with the newer models thrown in including the risers/ tails that are used
http://www.imcomarine.com/cal_store/...-polished.html
It would be nice to see a updated test of exhaust manifolds with the newer models thrown in including the risers/ tails that are used