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Topic: How much HP can you get from a V-twin Motor??  (Read 4401 times)

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cbsnbiker
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« Reply #40 on: April 21, 2011, 09:33:18 AM »




Nah, it's still the same car. Certain incremental improvements have always been part of the aftermarket. Who HASN'T replaced their stock exhaust on their bike, or put better springs/valving in it, or changed out the carb jets (or put in a power commander)? Still the same bike, right?



Me, pretty much.

My apologies in advance if I already posted this anecdote to this thread, but here goes.

Often I hear about how unreliable Harleys are. Well, one of the first things I ask a Harley owner if I'm making small talk is to ask what modifications he or she has made to the bike.

There are exceptions, but the typical response is a list of stuff: new carb, new pistons, new exhaust (or even straight pipes), lowered shocks, etc., etc., etc.

Then sometimes they talk about how the bike doesn't run quite right (or I can see and hear the problems), or it breaks down, etc.

Those who haven't modded their Harleys (or at least not much) seem to do better.

So, the question becomes, is it that Harleys are unreliable, or that the modifications make them unreliable?

My belief: the latter.
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« Reply #40 on: April 21, 2011, 09:33:18 AM »

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tomek
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« Reply #41 on: April 21, 2011, 07:54:32 PM »

It is more expensive to mod Civic then old American Iron .

Here are some prices for people who are ,,,,,,,ah older  .

Turbo kit , basically  ball bearing turbocharger , manifold , external wastegate  , downpipe - about 3-4 grand . I`m talking about quality parts , not some cheap made in china crap .

Standalone ECU (  piggyback won`t cut it ) - 1000 - 2000 $ .

Ungraded fuel system ( pump , adjustable fuel pressure regulator , higher flowing injectors , rail or two ) - at least 1000 $ .

Intercooler and associated piping , clamps ,etc - at least 1000 $.

Some sort of methanol/h2o injection - 400 bucks and up .

Compression needs to be lowered , set of forged pistons is not exactly cheap .

It is just way more involving and expensive compared to normally aspirated engines with one camshaft and pushrods .


BTW, I have never owned civic or any other front wheel drive Japanese car .

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« Reply #42 on: April 21, 2011, 09:08:00 PM »

I have a buddy who has built a couple 150+hp Harleys (yes I've seen the dyno runs) which stayed together very well, but I know when the one that ended up at 156hp was 124 CI it was making around 135 hp. 170 is a bit of a stretch.

We always liked to see the poor Harley riders who would show up at the Honda dealer's open house to put their bike on the portable dyno. The local HD dealer would sell them "kits" that would supposedly get them over 100 hp.  Reality, none of them pulled more than about 85. Talk about some sad pirates...
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JSharp
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« Reply #43 on: April 22, 2011, 06:38:16 AM »


I have a buddy who has built a couple 150+hp Harleys (yes I've seen the dyno runs) which stayed together very well, but I know when the one that ended up at 156hp was 124 CI it was making around 135 hp. 170 is a bit of a stretch.

We always liked to see the poor Harley riders who would show up at the Honda dealer's open house to put their bike on the portable dyno. The local HD dealer would sell them "kits" that would supposedly get them over 100 hp.  Reality, none of them pulled more than about 85. Talk about some sad pirates...


Your second paragraph are the guys I'm familiar with. Lot's of kits that include LOUD exhausts, some intake work, maybe or maybe not different cams. All on a stock displacement motor. I've ridden a couple of those bikes and lets just say I wasn't afraid of controlling all the power. My stock C-10 Concours felt at least as strong...
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