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Author Topic: 250hp for a Gen I Build, Which Way to Go?  (Read 244 times)

Offline krex

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250hp for a Gen I Build, Which Way to Go?
« on: December 11, 2017, 09:47:47 PM »
I'd like to hear some ideas on building a 250hp na motor. I'm not sure whether to go 1507 or 1600ccs. Same price just not sure of the drawbacks of the longer stroke. I'm thinking a good stock valve(I think?) ported head, 84mm,  big cams(not sure how big to go), billet rods, studs. Not sure about compression ratio but will run whatever gas is necessary. Sound like I'm in the ball park? What else? This is for a run what ya brung drag bike.
« Last Edit: December 11, 2017, 10:08:14 PM by krex »

Online Stainless1

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Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #1 on: December 11, 2017, 10:41:21 PM »
Contact Steve Knecum
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Online RansomT

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Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #2 on: December 12, 2017, 08:58:36 AM »
To get to 250 HP, a 1507 isn't going to get there.  If it was me, I would build a 1635 (10mm stroke). 
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Offline speedduck

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Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #3 on: December 13, 2017, 08:34:35 AM »
I dont know what size is the best for that kind of dragbike, but for the power, go big, 1600+ and .425" or .445" cams,
I am really interested to see how it turns out, using stock size valves, and what fuel , keep us posted.
 

Offline knecum

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Re: 250hp for a Gen I Build, Which Way to Go?
« Reply #4 on: December 17, 2017, 11:46:39 AM »
You can reach 250 no problem with a 5 or 6 1/4 stroker and up to 285 with 9-10 mill x 84 mm bores, stock valve heads.  Contact me if you  need assistance.