Best flame arrestor
03-17-2014, 07:28 AM
#24
Registered
I called K&N when I was looking to upgrade my flame arrestor as the Hardin I was using a sharp edge at the air horn. Based on their info the 9x3 would be so restrictive for me that it would pull enough vacuum to close my power valves. I went with a velocity stack style housing with the largest 14" K&N element. AT 5600 rpm I am still showing 0 vacuum so no restrictions for me. Most of the flame arrestors I have seen either are way to small or have serious flow issues due to right angles at the air horn.
03-17-2014, 08:09 AM
#25
So, I'll take this a step further and ask if anyone has seen any serious gains by removing the choke butterfly and milling off the choke housing on a Holley 800. Not much need for the choke butterfly in most marine applications - most of the time all you have to do is bump the throttle a few times to squirt some fuel in there and then just keep the idle speed up until the engine warms up a little.
03-17-2014, 11:08 AM
#27
632 if I can get 1.6hp per cu. in its over 1000. Problem is I'm building it under the wifedar. So I can't really spend the money to squeeze everything out of it. It will make 950 no problem the last 50+ will cost another 3-4 grand. Either way it will be to much for the boat. In good water the boat has been mid 90's with 850 in perfect water.
03-17-2014, 11:51 AM
#28
I called K&N when I was looking to upgrade my flame arrestor as the Hardin I was using a sharp edge at the air horn. Based on their info the 9x3 would be so restrictive for me that it would pull enough vacuum to close my power valves. I went with a velocity stack style housing with the largest 14" K&N element. AT 5600 rpm I am still showing 0 vacuum so no restrictions for me. Most of the flame arrestors I have seen either are way to small or have serious flow issues due to right angles at the air horn.
You don't happen to have a picture do you?
03-17-2014, 10:34 PM
#30
Registered
PM me and I will send you a photo.
Every modification is only as effective as it's necessity. Milling the air horn on an 800cfm carb on a 330 would be pretty ineffective, on a 572 it would be huge. Same thing with the flame arrestor, my 524 at 6000rpm needs lots of air.
Every modification is only as effective as it's necessity. Milling the air horn on an 800cfm carb on a 330 would be pretty ineffective, on a 572 it would be huge. Same thing with the flame arrestor, my 524 at 6000rpm needs lots of air.
