Engine Builders in CT? - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 15 (permalink) Old 09-20-2007, 08:59 PM Thread Starter
 
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Engine Builders in CT?

Some of you migh get sick of me asking about my RC51....but hey, you guys know more than me. Has anyone done any engine work to a 51 twin? or know someone who has? I'm in the eastern Connecticut area and am looking for someone to do a bore on it, or whatever. There are harley v-twin builders everywhere, but can they handle an import? Building it I'm sure they could do, but what about TUNING?? Thanks guys
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post #2 of 15 (permalink) Old 09-20-2007, 09:05 PM
 
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Originally Posted by 02HRC51 View Post
Some of you migh get sick of me asking about my RC51....but hey, you guys know more than me. Has anyone done any engine work to a 51 twin? or know someone who has? I'm in the eastern Connecticut area and am looking for someone to do a bore on it, or whatever. There are harley v-twin builders everywhere, but can they handle an import? Building it I'm sure they could do, but what about TUNING?? Thanks guys
sounds like you dont have a clue on what you want done. what type of results do you want to see?
to most engine guys, an engine is an engine. just dif tolerances, clearances, parts. however, they all usually specialize in a certain one, so ask around once you know what you want. im not in ct, but i can tell you alotta places take your money, then farm the stuff out and tax u.
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post #3 of 15 (permalink) Old 09-20-2007, 09:19 PM Thread Starter
 
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it's not a matter of not knowing what I want done, it is a matter of finding a decent engine builder/tuner and knowing exactly how far I take the 51 motor without putting the reliability on the chopping block or making it unstreetable.
Getting it to 150rwhp isn't gonna happen by putting on an exhaust or power commander. How many RC51's are out there that are modified that much? That's my point. It's not done often if att all and I would like to see what other peole have done, IF they've done it.
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post #4 of 15 (permalink) Old 09-20-2007, 09:30 PM
 
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ok-150 rwhp is the goal. thats what i wanted. what are you at now? and then i can answer your ?
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post #5 of 15 (permalink) Old 09-20-2007, 09:42 PM Thread Starter
 
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Stock 51 motor makes like 125? maybe, at the crank I believe. I don't know what the parasitic loss is on bikes, can't be that bad. But I figure at the wheel it makes about 110? And torque is about 75 lbs. ft. crank. So to get 150+ rear wheel hp I probably need about 175-180 crank perhaps? And obviously I would like to keep the revs up, maybe even raise the redline to superbike specs of about 12,000, if that's a possibility.
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post #6 of 15 (permalink) Old 09-21-2007, 07:56 AM
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Originally Posted by 02HRC51 View Post
Stock 51 motor makes like 125? maybe, at the crank I believe. I don't know what the parasitic loss is on bikes, can't be that bad. But I figure at the wheel it makes about 110? And torque is about 75 lbs. ft. crank. So to get 150+ rear wheel hp I probably need about 175-180 crank perhaps? And obviously I would like to keep the revs up, maybe even raise the redline to superbike specs of about 12,000, if that's a possibility.
Its a V-twin, you dont lose as much HP from the crank top the rw, like you would on an I4. And yes it is possible to raise the redline to 12.5K. The guy I work with that has an RC51 claims it has 135HP at the wheel with Sato exhaust and a power commander.
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post #7 of 15 (permalink) Old 09-21-2007, 09:47 PM
 
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full ex, pc & you'll get the most from the redoing the heads-porting it, sinkin the valves into the head, etc., without losing reliability. aggressive cams, bigger valves, pistons, bump up the c.r. alil, and match all the parts to each other should get you where you wana be, but reliability can suffer .

150 at the wheel....why not a 1000rr? way cheaper, and more reliable than a hot rodded 51.

just saying-maybe you're racing it, idk
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post #8 of 15 (permalink) Old 09-22-2007, 08:44 PM Thread Starter
 
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Yea, it is hard to beat a new liter bike. And I have seriously considered getting one. But I have always been a fan of racing v-twins. The sound alone makes them incredible and it's fun to go against the grain a little. I appreciate the advice. It gives me a general idea of where I need to go with it. Out of curiosity, for a good head job like your talking about, about how much do you think that would run?
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post #9 of 15 (permalink) Old 09-23-2007, 04:59 AM
 
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head work is expensive. you can easily spend 2500.

i just had a thought-maybe you could build a stroker motor
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post #10 of 15 (permalink) Old 09-23-2007, 11:02 AM Thread Starter
 
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Alright, let's run with the stroker idea, because really that is decent one. I assume a custom made crank would be in order along with connecting rods and pistons. Then again, leaving the bore alone I could probably just go with HC pistons? And then clearance issues might come up so some notching may have to be done. And with all that a little head porting and polishing to make it all flow more and better.

I hate to say this, but maybe I need to go talk to some Ducati guys...... But one more thought... harley has been known to make some racing twins, and those guys are EVERYWHERE!! Think they might be up to the job?
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post #11 of 15 (permalink) Old 09-23-2007, 11:26 AM
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post #12 of 15 (permalink) Old 09-23-2007, 11:58 AM
 
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http://www.gizmag.com/go/3314/

Figure on spending $30-40K to get it to put out that kind of hp with reliability....you'll need to find a builder that has done Superbike engine building...new heads, jugs, pistons ,cranks, rods, wrist pins, rings, new radiators, EFI, waterpump oil pump....strengthen cases...on and on...........

There is a guy in PA building 185 hp TLR motors for BOTT racing and he gets $35K a pop..........

Go buy a 1098.

PS Stroker motors turn slower than a standard motor for the same hp....longer stroke means faster piston speeds; the limiting factor to more hp in most instances...........
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post #13 of 15 (permalink) Old 09-23-2007, 07:45 PM
 
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Originally Posted by 02HRC51 View Post

I hate to say this, but maybe I need to go talk to some Ducati guys...... But one more thought... harley has been known to make some racing twins, and those guys are EVERYWHERE!! Think they might be up to the job?
more like a ducati dealer lol

i think you said you plan on racing it too-should check the rules on what you can do to the bike before you do anything. i was thinking bigger bore AND stroke when i mentioned stroker motor by the way.
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post #14 of 15 (permalink) Old 09-23-2007, 08:35 PM
 
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. i was thinking bigger bore AND stroke when i mentioned stroker motor by the way.
Doesn't matter...longer stroke means just that; longer distance to travel during the turning of the crank means faster piston speeds for the same rpm regardless of the bore; the road to HP in naturally aspirated motors is RPM, the road to torque is longer stroke.
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post #15 of 15 (permalink) Old 09-23-2007, 09:31 PM Thread Starter
 
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So realistically, going naturally aspirated gained power will cost MONDO bucks.....hence, yea, a 1098 would probably be better.

Alright, so foregoing the complete engine overhaul, I've mentioned turbos before I think. There is a guy floating around on You Tube with a turbo 51 and I KNOW that thing has got to be making the power I'm after. Even with it being a custom deal, to get a small turbo on there should be about what, 3-4 grand? And with only running a few lbs. of boost (3-6?) should get the 51's engine well over 150hp. Idiots on harleys turbo their behemoths....why not a honda twin?
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