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Old 02-20-2020, 09:22 PM   #21
Ronnieroadster
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Default Re: Centre exhaust port baffle or fourth port?

If i decided to use a port divider the type made by Dunn engineering a very long time ago would be my choice. The Dunn divider is not a heavy casting it was two U shaped channels made from stainless steel placed back to back and spot welded together and of course shaped like the port. This divider is extremely narrow which of course reduces the port restriction the divider will cause.
From what I have been able to get in the way of HP out of 292 cubes without the divider I feel its not worth the effort. Learn from what Pete wrote in post #14 theres more power to be gained by thinking outside the box.
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Old 02-20-2020, 09:37 PM   #22
Tim Ayers
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Default Re: Centre exhaust port baffle or fourth port?

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Originally Posted by Pete View Post
Port dividers work good if you make them yourself. Mine are only about 1 inch square, 1/8 inch thick and extend only to the centerline of the valves.

Adding only the center top port probably won't be noticed on an engine running on gas. Additionally adding the two top, end ports will bring a noticable improvement.
On a car other than a dragster it might become a problem dealing with an exhaust pipe system that meets the rules AND STILL WORKS.

If you can run race gas or alcohol you will find more improvement in upping the compression to 14 to 1 and running 2 ring flat top gas ported pistons with low tension narrow rings. Add 5 stage dry sump oiling and you have 40 more hp.
Hey Pete,

I should have mentioned you as well. Glad you posted some of your findings.
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Old 02-20-2020, 11:33 PM   #23
Ol' Ron
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Default Re: Centre exhaust port baffle or fourth port?

Like others on this forum, I;ve tried many things and never knew if they worked, Pete Raced so he knew if a mod worked. Putting an engine on a dyno like JWL did for all his mods told him what worked and how much. There is one thing you must take into consideration is: what is the reason for thr mod, MAX HP?? That takes place at WOT. The only place you can use this us on a race track. I'm working on an engine for the street that I hope will make good power, and fuel economy , at avery reasonable cost, using all the information I;ve gained here and over 60 years putzing with these engines.. Might work, might not, but it's something to do.
Gramps (Formally O'l Ron)
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Old 02-21-2020, 06:04 PM   #24
Flathead
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Default Re: Centre exhaust port baffle or fourth port?

Quote:
Originally Posted by estout81 View Post
Here's Mark and his flathead.
I heard that motor run in the basement of Marks house in Dundee a LONG time ago. Those zoomies were loud!!
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Old 02-21-2020, 06:32 PM   #25
tubman
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Default Re: Centre exhaust port baffle or fourth port?

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Originally Posted by Flathead View Post
I heard that motor run in the basement of Marks house in Dundee a LONG time ago. Those zoomies were loud!!
I'm sure the engine sounded great, but anything is loud if you start it in the basement.

Trust me, I've done it.
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Old 02-21-2020, 06:39 PM   #26
Mart
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Default Re: Centre exhaust port baffle or fourth port?

^^^ Lol above.
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Old 02-21-2020, 06:43 PM   #27
JSeery
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Default Re: Centre exhaust port baffle or fourth port?

Yep, try a SBC with a healthy cam and zoomies!
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Old 02-21-2020, 07:29 PM   #28
tubman
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Default Re: Centre exhaust port baffle or fourth port?

To be specific, it was a Yamaha V-Max motorcycle. Half the cylinders and mufflers. My better half didn't speak to me for a week!
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