cam and piston recomendations wanted
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Stage III
Joined: Jan 2011
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cam and piston recomendations wanted
I'm rebuilding my friends 79 FLH top end. He wants a little more power without sacrificing reliability. Bike already has an S&S super e carb. I was thinkin about a new cam and maybe bumping the compression up a little bit. Any ideas on what cam would be good? how about piston, Keith Black, wiesco? Compression ratio? i was thinkin no higher than 9:1. any suggestions on what you have done as far as what works well together or what doesn't would be greatly appreciated.
Club Member
Joined: Mar 2009
Posts: 66,126
Likes: 51,456
From: Niles Canyon Ca.
Skip the hi comp. forged pistons , they are a pain in shovels because of the tighter fit and heat issues particularly during break in doesn't take much in overheat to scuff the skirts and by by $350 pistons . I changed a bunch of them . Go 8 8.5-1 on comp. cast pistons and you have a long lived reliable motor that will use the crap they call gas anymore without knocking or other ignorance .
I like Vthunder cams for shovels , they use hyd. lifters and start making power at low RPM like 1200 and up to 6000 on a couple . Most other name cams like Andrews and Crane don't come till over 2200 to 2500 rpm so your shifting and revving a lot more . 55mph is around 2500 to 2800 on a stock geared shovel so you haven't hit the power band yet . I've used the Vthunder cams in my 88 & 93" HiPo shovel motors for yrs with great results .
Best bang for the money on a shovel is some head work , a set of the new late model type hydraulic lifters and a decent cam . You'd be surprised how well a shovel responds to that without going big bore .
I like Vthunder cams for shovels , they use hyd. lifters and start making power at low RPM like 1200 and up to 6000 on a couple . Most other name cams like Andrews and Crane don't come till over 2200 to 2500 rpm so your shifting and revving a lot more . 55mph is around 2500 to 2800 on a stock geared shovel so you haven't hit the power band yet . I've used the Vthunder cams in my 88 & 93" HiPo shovel motors for yrs with great results .
Best bang for the money on a shovel is some head work , a set of the new late model type hydraulic lifters and a decent cam . You'd be surprised how well a shovel responds to that without going big bore .
Club Member
Joined: Mar 2009
Posts: 66,126
Likes: 51,456
From: Niles Canyon Ca.
http://www.jirehcycles.com/
Also you can order from here too if needed , I've used their stuff also sometimes the new cylinders are a bit rough looking with casting flash but they clean up nice with a bit of work and the prices are right . I've run the 88" shovel kits over 100,000 no problems .
http://www.dragonmans.com/dragonman/.../the_shop.html
Good Luck , PM me if you've got questions I do a LOT of shovel work .
Tourer
Joined: Jun 2010
Posts: 252
Likes: 4
From: POZO, CAL.
I run 10-1 comp pistons ,Andrews B-Grind Cam with solid lifters. Like TWISTED said it doesn't kick in later, but with a larger tranny sprocket. Crack the throttle at 55 and hold on! She's geared for the highway.
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