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Speed,Combat,Scale,Racing => Carrier => Topic started by: Bob Heywood on February 29, 2012, 10:55:15 AM

Title: Carburetor question
Post by: Bob Heywood on February 29, 2012, 10:55:15 AM

I'm looking at the O.S. Max 35 AX for Profile. It is fitted with a 21K carb. The throttle bore is 0.262. The spigot o.d. is 0.511. What might be some options to feed more air?

Thanks.

Title: Re: Carburetor question
Post by: bill bischoff on February 29, 2012, 03:49:31 PM

That is the same neck (spigot) diameter as the OS 4BK. The best way to get one of these is watch ebay for a ragged out OS 40 or 45 FSR. The OS 4D is very similar, except the neck diameter is .530 instead of .510. These carbs came on the 40 and 46 SF, and can be easily turned down to fit. They are more recent and easier to find than the 4BK. Also, check the Perry web site. They now list all of their carb neck diameters and bores, so you can pick something that will work.

Title: Re: Carburetor question
Post by: john vlna on February 29, 2012, 05:32:59 PM

Here is the link to the perry carbs http://www.perrypumps.com/prod01.htm

Title: Re: Carburetor question
Post by: Bob Heywood on February 29, 2012, 06:02:50 PM

Thanks for the responses. I just ordered a Perry # 4100. It has a 0.340 throat. Conley pretty much choked whenI told him what I wanted it for. But, he gladly took my money.

My goal is to use current production components from normal retail sources unless there simply is no other recourse.

Title: Re: Carburetor question
Post by: eric david conley on February 29, 2012, 06:16:01 PM

     I've been using Perrys on my Nelson engined profile and have found that the largest neck I can get away with is .312 which in your case would be a 1101. Anything larger than .312 would cause the Nelson to sag on the take off. Eric

Title: Re: Carburetor question
Post by: Bob Heywood on February 29, 2012, 06:36:50 PM

Eric,

Thanks for the word of caution. I figured I was pushing the limit.

Bob