2-Slit exhaust on a Black Widow?

WingingIt74 Sat Mar 22, 2014 3:44 pm

I have several Black Widows with 2-Slit Sure-Start type exhaust ports. Are these the right cylinders?

**Admin** Sat Mar 22, 2014 5:51 pm

Its correct for a late 70s early 80s Black Widow as long as the porting is correct. It should be a twin bypass with 1 boost port on each bypass, top fin milled and no SPI.

Take a look at this thread, https://www.coxengineforum.com/t3655-are-the-leisure-dynamics-black-widows-supposed-to-have-slotted-exhaust

tru168 Sat Mar 22, 2014 8:23 pm

Exactly the same cylinder as Surestart ?? Compare to No. 1 SPI cylinder, which one is more powerful ?

Jason_WI Sat Mar 22, 2014 8:26 pm

The early twin slit cylinders did not have the extra boost port milled like the later sure start cylinders.

dckrsn Sun Mar 23, 2014 5:02 pm

Jason_WI wrote:The early twin slit cylinders did not have the extra boost port milled like the later sure start cylinders.

......and some of them weren't top milled.
Bob

**Admin** Sun Mar 23, 2014 5:12 pm

I'm thinking my cylinder list needs to be revised, its all info I got from others years ago. https://www.coxengineforum.com/h23-cylinder-identification If anyone who has known original engines wants to help go over the list, that would be great. I see the non .049 engine cylinders haven't yet been completed.

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2-Slit exhaust on a Black Widow?

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Re: 2-Slit exhaust on a Black Widow?