building 80"(85") evo need advice
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6th Gear
Joined: Oct 2009
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From: western mass
building 80"(85") evo need advice
hi this is my 1st time posting but ive read a ton on this site!
ok im building my evo for the street and wanna get numbers 80+tq and 80+ hp
but more important i want a broad tq band thinkin between 1500 n 5500
ive decided to port the stock heads and put in slightly larger valves from manley with a good valve job but thats where things get shady ive read woods cams are tq biased cam grinds which sounds right where i wanna be where the confusion comes in is which one is good for my settup and has anyone run these i would like to matchup everything on my heads to the cams to make the most power
p.s. anyone run that 85" rev performance big bore kit?
ok im building my evo for the street and wanna get numbers 80+tq and 80+ hp
but more important i want a broad tq band thinkin between 1500 n 5500
ive decided to port the stock heads and put in slightly larger valves from manley with a good valve job but thats where things get shady ive read woods cams are tq biased cam grinds which sounds right where i wanna be where the confusion comes in is which one is good for my settup and has anyone run these i would like to matchup everything on my heads to the cams to make the most power
p.s. anyone run that 85" rev performance big bore kit?
Tourer
Joined: Apr 2007
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From:
Who's doing the heads? If you're set on a Wood's cam give Hillside a call. They have a lot of experience with his stuff.
I had a couple customers use those 85" kits. Made good power.They never had any problems but I'm not a fan of nikasil cylinders for Harleys yet. I don't like boring cylinders thin either. Old fashioned I guess.
I had a couple customers use those 85" kits. Made good power.They never had any problems but I'm not a fan of nikasil cylinders for Harleys yet. I don't like boring cylinders thin either. Old fashioned I guess.
Club Member
Joined: Jun 2007
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From: Bedford UK
When I modified my original evo I had it stroked to 89 inch with a JIMS crank. With a rebore it actually made 90 inches! Seemed to me a far more effective way of improving performance. Beware - performance is addictive - I now have an S&S 107!
Sponsor
Joined: Dec 2007
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..............or bore the cases, re-balance the crank(in-house) and use an Axtell Mountain Motor cylinder kit to bring it to 97".
With a little Wood 6 or Andrews 27, 95-100 hp, and 105-110 ft/lbs is within easy reach.
Scott
With a little Wood 6 or Andrews 27, 95-100 hp, and 105-110 ft/lbs is within easy reach.
Scott
Cruiser
Joined: Apr 2007
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From: Boston area
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6th Gear
Joined: Oct 2009
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From: western mass
All gr8 suggestions I was thinking today about actual ci" n the end result versus cost n think 85" kit isn't worth a grand, the axtell stroker kit what does it involve? I don't want to bore the cases at all, dependabilty is a most in this build. I've read a few people that bore the cyl .10 thousands use complete seal rings a good cam head work (stock heads) n make great power ....I'm gonna run se or ss adj push rods n ss roller rockers tappets will prob just be stock harley (I've heard gr8 things about runnin stock over aftermarket)
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6th Gear
Joined: Oct 2009
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From: western mass
Ps if I don't bore the case or replace it with an ss how dependable is it? Once u get 100 hp outta it? I like the idea of the stroker kit if I don't havta bore cases if I do I would think of ss case but then cost effectivness kinda goes out the window
Club Member
Joined: Jun 2007
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From: Bedford UK
The reason I bought an S&S 107 is that, having run my stroker for several years, I wanted a further boost in performance and increasing bore size on my stroker seemed the way to go. What I found is that early Evo cases like mine are not suitable for boring out, but later ones (from around 93, but I am not sure) had stronger cases and can be rebored as well as stroked. The only safe way to increase bore size for me was to buy new cases and that increased costs to silly levels, taking into account paying someone to do the work.
An 85" conversion is no more than boring out your stock cylinders to maximum rebore size and you can do that more cheaply than buying new cylinders. Stock capacity is actually 82", so the increase is not as much as it sounds. Every +.020" on the bore gives roughly an extra cubic inch.
I had my stroker tuned for torque rather than outright power and that was about ten years ago now. Also here in the UK we don't have the same high levels of expertise available that Hillside and others have. My advise is find a good builder and see what they recommend. My builder used KB pistons to increase compression ratio, gas flowed the heads, also rebuilt the crank bearings, honed them and used oversize rollers. Motor ran very smooth, better than my S&S!
An 85" conversion is no more than boring out your stock cylinders to maximum rebore size and you can do that more cheaply than buying new cylinders. Stock capacity is actually 82", so the increase is not as much as it sounds. Every +.020" on the bore gives roughly an extra cubic inch.
I had my stroker tuned for torque rather than outright power and that was about ten years ago now. Also here in the UK we don't have the same high levels of expertise available that Hillside and others have. My advise is find a good builder and see what they recommend. My builder used KB pistons to increase compression ratio, gas flowed the heads, also rebuilt the crank bearings, honed them and used oversize rollers. Motor ran very smooth, better than my S&S!
Last edited by grbrown; Nov 6, 2009 at 04:04 AM.