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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #121  
Old 5th June 2020
Highly-Dangerous's Avatar
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Sportster/Buell Model: XL 883 ₪ 1275
Sportster/Buell Year: 2006
Other Motorcycle Model: Big Dog K9
Other Motorcycle Year: 2006
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Quote:
Originally Posted by aswracing View Post
By my calculations, you have a 10:1 static compression ratio.

Personally, I think the Andrews N4's are the best bolt-in cams for your generation of bike, with compression ratios ranging from 10:1 to 10.5:1.

With N4's, your corrected compression calculates out to 9:1 and the ccp is 191psi at sea level on a 64 degree day. That's assuming .030" head gaskets and zero deck height.
Your Calculator is pretty accurate I'd say. I got my mechanic to check the ccp and it was spot on as per the Calculator. 210 psi in both cylinders.

That was done Cold though. My questions are;

How much difference there is, usually, between Cold & Hot Tests?

Is it Ok 210 psi Cold?

- I did install the W cams.
- Stock 883 (2006) Heads.
- Basic 1275 kit.
- 42 Mik.

I hope my questions (and your answers) help others too.

Cheers.



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  #122  
Old 5th June 2020
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Sportster/Buell Model: Sportster iron 883>1275
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Quote:
Originally Posted by vagrant318 View Post
I did impact but again more headwork requires probably more extreme cams than n4 which are bolt in. Like you get smash headwork, you need higher lift cams to make that worthwhile. Make sense? That was my take away from hammer at any rate

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Quote:
Originally Posted by vagrant318 View Post
I still have the stock ignition which cuts off like 5.5k RPM or something very low as I don't rev that high anyway but with 1275 and headwork with n4 cams still feels much stronger than stock or 1250 with w cams if that helps. I wonder what my set up would feel like with w cams too, I would guess just rev out real quick and nothing above 4k which is lame IMO. But that's kinda a guess..

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I think the w cams feel like they fall off very early compaired to the n4’s , I didn’t really like them as much as I like the n4’s
That’s what I thought with my set up anyway. For me personaly with my set up I like the n4’s over the W , but again that’s just me . I’m sure someday in the future way down the road I’ll go with different pistons and more headwork but that will be at least a few years away . Now there’s always the Off chance that maybe I could be lucky enough to hit the lottery LOL and then I would send them an entire engine from the bottom up to get done but that’s probably not gonna happen anytime soon lol
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Ghostdog 2016 iron883<1275 Hammer prefomance kit, energy one extra plate clutch, 15percent spring,N4 cams, ported 883 heads ,danmoto 2-1 exaughst ,Dynojet powervision tuner .
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