Exhaust Port Hieght

[sinister shee]

can anyone tell me what the exhaust port hieght on a ported cylinder should be. mine is like 28 or 29 mm. can i go more? and i want to put a 4mm longrod stroker crank in it and i heard you have to have a different port height for that setup. would appreciate any help especially from a pro thanks alot.

[fixitrod]

I wouldn't go any higher than that. You have to remeber it's more than height.. .it's shape. Porting is an engineering art.

[PassionRE]

Max. port height spec will vary depending on how your stroker is set-up. Max spec will be different on a base plate motor vs. a revised stroker dome set-up....Jim

[fixitrod]

Max. port height spec will vary depending on how your stroker is set-up. Max spec will be different on a base plate motor vs. a revised stroker dome set-up....Jim

Soooo... it sounds like there is no real answer. lol. That's why builder like Jim at Passion are out there.

[sinister shee]

i will be using the base plate spacer. is 28mm to much, not enough ive got the race logic porting now, do i need to take it to a builder to have any thing else done. the porting ive got now work great with stock crank, my friend has porting done by a local well known builder and we run the same mods and run just about the same. just wondering about the stroker with base plate.

[PassionRE]

Max. port height  spec will vary depending on how your stroker is set-up. Max spec will be different on a base plate motor vs. a revised stroker dome set-up....Jim

Soooo... it sounds like there is no real answer. lol. That's why builder like Jim at Passion are out there.

Oh there are answers to that question, probably a dozen different ones depending on who you ask. Actually, the type of stroke compensation of the stroker is just a portion of whats considered in a good running stroker motor. Its much more complex than just that...Jim