80 vs 89 stroker build, and what cam
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From: Indiana
80 vs 89 stroker build, and what cam
Hello all, so I'm getting ready to do a build on my 1996 80 evo. I've covered some of this before in prior threads. Already have a bassani road road b4 and s&s teardrop air cleaner, plus a dynojet kit for the cv40. Plan to keep the original carb. I was going to do a set of 10:1 wiseco pistons with a wood w6(not the h) and the stock 80". Either a dynatek 2000i or a hi4 ignition and of course all the supporting parts for a build(cam bearing, lifters, etc.). I keep going back to the 89" stroker though. I know with stock heads and their low compression pistons, it's supposed to be 9.25:1 static. Would the w6 still be a good cam choice for an 89? Should I go with a thinner head gasket and/or mill the jug bases to get the compression up a little more to close to 10.1? I typically have 93 octane available, but would like it to be able to run 91 if i get unlucky and have to use it. I didn't really want to have to get into taking much if any material out to make everything fit. I'm around 320 lbs on an flhtc. Most of my riding is solo, but occasionally ride 2 up with my girl at about 120 lbs. I don't think I want to spin the engine past 55-6000 rpms, and want most of my power available lower for good roll on while cruising. I do run it hard fairly often, but I'm not trying to set the world on fire, just get a good amount more usable power so the bike seems to get out of its own way and is a little thrilling to ride. I was hoping for 80-85 hp at the tires and 85-90 ft lbs of torque with the 80 build. Does that seem pretty realistic? How much would the 89 improve the power figures over the 80? How much would the fuel economy tank?
Last edited by Superchargeme; Aug 2, 2022 at 12:04 PM.
Grand HDF Member
Joined: Oct 2006
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From: DFW
Some info for 89" Stroker...https://www.hillsidecycle.com/engine-kits I believe it is Scott is whom you should speak to. Scroll down the engine kit area.
Seasoned HDF Member
Joined: Dec 2006
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From: Black Hills
Here are the dyno numbers for real builds, you may find some help here.
https://www.woodcarbs.com/evo-1
Some info for 89" Stroker...https://www.hillsidecycle.com/engine-kits I believe it is Scott is whom you should speak to. Scroll down the engine kit area.
Seasoned HDF Member
Joined: Aug 2008
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From: Ohio
The difference between a 80" and 89" is the 89" will pull the same power @ 3500 where a 80" needs 5000. Either engine your going to need some headwork to get the numbers your talking, both a 80" & 89" respond well to mods. Ran a 89" @ 10-1, flat tops, ported heads milled to 72cc, Woods W6H, 2-1 Propipe for 10 plus years being reliable and very tough in a street race. 80's with some work are very efficient and handle most needs, 89" pull harder in lower rpm's but the can carry into 6200 with a W6H when needed, W6 will be out of steam @ 5500.
W6, W6H in a heavy bike, jump up the duration and intake valve closing for a light bike, V Thunder makes good cams, a VT5005 can work real good in a 89" if only wanting to go 9.5-1, the regular series make good power without shocking the valve train.
W6, W6H in a heavy bike, jump up the duration and intake valve closing for a light bike, V Thunder makes good cams, a VT5005 can work real good in a 89" if only wanting to go 9.5-1, the regular series make good power without shocking the valve train.
Last edited by 1997bagger; Aug 2, 2022 at 09:25 PM.
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