Carb spacers
I am getting close to getting my engines together and was about to order some carb spacers for my 496's with dart intakes.
Any suggestions regarding the two different types of carb spacers. *the open type *or the 4 hole ones personally I would think the open type considering their going on a open plentum single plane? Any dyno results as to either of the two??? Thanks, John |
The open spacer is better for top end speed because it inceases fuel / air fogging in the manifold prior to the runners. The 4 hole / individual runners are better for lower speed transition in the same fashion as dual plane manifolds (so I've read and been told). I've got one of each and I plan on figuring out which one works better. The 4 hole style might take up some mid range slack where my single plane manifold might cause hiccups. The open spacer I'll try when the engine is broken in and I want all out speed so I can see if it makes any difference.
I'd love to see if anyone has any dyno results or other flow data. Another question I'd like to throw into the ring is: is there any bennefit to a 2" spacer instead of a 1" spacer? And is it worth trying both at the same time? (4 hole, then open, then manifold) |
Originally Posted by Ghostrider
(Post 2922916)
The open spacer is better for top end speed because it inceases fuel / air fogging in the manifold prior to the runners. The 4 hole / individual runners are better for lower speed transition in the same fashion as dual plane manifolds (so I've read and been told). I've got one of each and I plan on figuring out which one works better. The 4 hole style might take up some mid range slack where my single plane manifold might cause hiccups. The open spacer I'll try when the engine is broken in and I want all out speed so I can see if it makes any difference.
I'd love to see if anyone has any dyno results or other flow data. Another question I'd like to throw into the ring is: is there any bennefit to a 2" spacer instead of a 1" spacer? And is it worth trying both at the same time? (4 hole, then open, then manifold) |
Originally Posted by getrdunn
(Post 2922910)
I am getting close to getting my engines together and was about to order some carb spacers for my 496's with dart intakes.
Any suggestions regarding the two different types of carb spacers. *the open type *or the 4 hole ones personally I would think the open type considering their going on a open plentum single plane? Any dyno results as to either of the two??? Thanks, John |
Originally Posted by MER Performance
(Post 2922991)
Try a HVH super sucker, you'll like the dyno results, but' try it after testing with-out it first.
All the open spacers will do is move the power into higher rpms. The open ones work better on dual plane intakes. |
I use the HVH on my 496. I believe it picked me up 100-200 RPM. According to my "seat of the pants dyno" I dont feel there was any negative impact by using it. I am using an 850 Demon carb and a Victor Jr intake with the 1 inch spacer. The condensation that forms on it when running is pretty interesting too.
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I guess a good thing to do would is buy one and run with it and with out it to see if it helps out. The design appears to make good sense (HVH Super Sucker). The results will be another. I'll be sure and post the results. Thanks for the input guys.
John |
Please see post #22 here:
http://www.offshoreonly.com/forums/g...-i-need-3.html Feel free to read my article here: http://marineperformancetechtalk.com/carb_spacers.htm If you do an advanced search in OSO's search under 'super sucker' and for author put in 'sb' you'll see much of my ramblings. Also, feel free to ask questions but you'll need to tell me all engine specs including your top rpm / carb / flame arrestor man and size for me to make a suggestion for you. Carb spacers are a part of my daily life. I eat, sleep, and drink the stuff. |
Originally Posted by SB
(Post 2923588)
Please see post #22 here:
http://www.offshoreonly.com/forums/g...-i-need-3.html Feel free to read my article here: http://marineperformancetechtalk.com/carb_spacers.htm If you do an advanced search in OSO's search under 'super sucker' and for author put in 'sb' you'll see much of my ramblings. Also, feel free to ask questions but you'll need to tell me all engine specs including your top rpm / carb / flame arrestor man and size for me to make a suggestion for you. Carb spacers are a part of my daily life. I eat, sleep, and drink the stuff. Thank you for the great info. Much appreciated. John |
I gained 25hp Dyno HP but using a HVH 1" one.800 hp 632.
So they work. |
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