Harley style Vtwin swap? |
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Harley style Vtwin swap? |
SLRPY MN |
Oct 7 2015, 10:44 PM
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#1
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Newbie Group: Members Posts: 22 Joined: 25-February 15 From: Bremerton, Wa Member No.: 18,477 Region Association: Pacific Northwest |
Pulled the 1.7L out of my 1972 914 the other day to chase down some issues ive been having trying to get the engine to turnover properly. and being the freedom loving harley davidson riding american i am (also with constant shit getting i recieve from my roommates) we've been throwing the idea of using an Aircooled V-twin 100cu in plus Harley engine as a powerplant to reduce weight and add power and i can't help to ask why haven't i seen this yet.
so far our idea is build a Flange on the Crank that bolts to an aluminum flywheel then the 914 transmission... I'm open to ideas and criticism... (IMG:style_emoticons/default/flag.gif) Attached File(s) Porsche_engine.htm ( 328.58k ) Number of downloads: 54 |
Mueller |
Oct 7 2015, 11:09 PM
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#2
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
Sell Harley motor, buy S&S motor instead (IMG:style_emoticons/default/smile.gif)
Not too crazy... http://thekneeslider.com/motorcycle-powered-cars/ A few pretty neat ones using motorcycle engines...even the V-twin http://thekneeslider.com/harley-davidson-p...t-of-milwaukee/ |
SLRPY MN |
Oct 7 2015, 11:13 PM
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#3
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Newbie Group: Members Posts: 22 Joined: 25-February 15 From: Bremerton, Wa Member No.: 18,477 Region Association: Pacific Northwest |
To be completely honest the idea is to use an S&S 113cu in or 124 cu in...
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cali914 |
Oct 7 2015, 11:36 PM
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#4
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cali914 Group: Members Posts: 447 Joined: 26-April 06 From: Berkeley Ca. Member No.: 5,934 Region Association: Northern California |
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Reno914 |
Oct 7 2015, 11:38 PM
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#5
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Newbie Group: Members Posts: 31 Joined: 18-August 09 From: Reno Member No.: 10,694 Region Association: Northern California |
To be completely honest the idea is to use an S&S 113cu in or 124 cu in... That would be awesome! Those motors make good torque too, I think over 125 ft-lbs. (IMG:style_emoticons/default/beerchug.gif) Reno |
SirAndy |
Oct 8 2015, 12:05 AM
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#6
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Resident German Group: Admin Posts: 41,606 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
i can't help to ask why haven't i seen this yet. My best guess would be because those engines were not built to schlepp around a 2000+ lbs car. What does the torque curve look like on one of those? (IMG:style_emoticons/default/idea.gif) I would hate to have to sidestep the clutch at 8000 rpm every time i want to get going ... (IMG:style_emoticons/default/shades.gif) |
gfg3 |
Oct 8 2015, 04:46 AM
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#7
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Never Too Old Group: Members Posts: 117 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None |
I'd be a little worried about cooling. Those big twins normally sit out in the airstream.
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DBCooper |
Oct 8 2015, 06:09 AM
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#8
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
My best guess would be because those engines were not built to schlepp around a 2000+ lbs car. And that's a pretty good guess, I'd say. All the cars I've ever seen with motorcycle engines are exceptionally light, unlike the 914. Although some of those big ol' Harley riders, two up, do probably come close to that 2000 lb. barrier. And as a heads-up I just read about the adaptation of the S&S engine to the new Morgan, and they found that the torque pulses from the big V-Twin hammered the drive train so much it broke things. They ended up using a rubber coupler between the engine and transmission to soften the blows. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.dailymail.co.uk-2618-1444306162.1.jpg) |
Olympic 914 |
Oct 8 2015, 06:11 AM
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#9
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Group: Members Posts: 1,662 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States |
My best guess would be because those engines were not built to schlepp around a 2000+ lbs car. What does the torque curve look like on one of those? (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/shades.gif) Being a big Harley fan you would think I would jump on this idea. But I would recommend against it. First I think cooling would be an issue. Second the money you would spend on a built Harley type S&S engine would be better put towards a SBC conversion. Or just building up the stock engine you have. My touring bike has a built 117 ci engine or about 1920 cc. with a bike weight of around 800# and add another 450# of passengers and gear loaded for a trip = 1250# now it does run really good and has no problem exceeding 100 mph for extended periods. ( on a closed course obviously (IMG:style_emoticons/default/happy11.gif) ) having it pull around 2000+ lb car would be underwhelming. when you consider the barrels of cash I dumped into this engine to get it to this point, you would be better served to spend that money on rebuilding the 1.7 into a 2.0, a 2056cc or larger. and everything just fits in. FWIW here is a copy of my Harley 117 dyno run.. top line is HP read on left. bottom line is torque read on right. rev limiter is set at 6250 thats why dropoff at end. |
DBCooper |
Oct 8 2015, 06:18 AM
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#10
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
Wow, that's impressive torque. I've never seen a Harley (or S&S) graph before. Very cool.
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EdwardBlume |
Oct 8 2015, 07:43 AM
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#11
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California |
Wow, that's impressive torque. I've never seen a Harley (or S&S) graph before. Very cool. (IMG:style_emoticons/default/agree.gif) That's a nice readout for a Harley.... |
HalfMoon |
Oct 8 2015, 08:08 AM
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#12
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
Hmm...perhaps a water cooled motorcycle engine? Hybusa?
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mbseto |
Oct 8 2015, 08:15 AM
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#13
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Senior Member Group: Members Posts: 1,253 Joined: 6-August 14 From: Cincy Member No.: 17,743 Region Association: North East States |
Get 2 twins, and just swap in the cylinders and pistons. :-)
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veekry9 |
Oct 8 2015, 02:32 PM
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#14
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OldMember Group: Retired Members Posts: 3,068 Joined: 17-June 13 From: TO Member No.: 16,025 Region Association: Canada |
A shroud and fan to cool the whole block is needed to keep things unmelted. An expensive way to arrive at an aircooled 4.A six however is more appealing. (IMG:style_emoticons/default/biggrin.gif) A unique solution to the need for speed. SportyPrincess,at what weight is too much?500Lbs? |
ClayPerrine |
Oct 8 2015, 06:14 PM
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#15
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Life's been good to me so far..... Group: Admin Posts: 15,410 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Something like this:
(IMG:http://www.914world.com/bbs2/uploads_offsite/cdn.rideapart.com-1143-1444349677.1.jpg) That is a Toyota Prius with a Harley motor in it. They call it a "ToyoHog Hybrid-Davidson". It was built for the 24 hours of Lemons racing series. It is the slowest, loudest thing on the track. Here is a video of it running. We were there watching it race. https://www.youtube.com/watch?v=yK2AxFpOh14 Fun idea, but if I remember right, it kept eating clutches. |
SLRPY MN |
Oct 8 2015, 08:21 PM
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#16
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Newbie Group: Members Posts: 22 Joined: 25-February 15 From: Bremerton, Wa Member No.: 18,477 Region Association: Pacific Northwest |
So I agree with the concern for cooling In which my major ideas to solve this is to fabricate some duct and shrouds to scoop air from under the car and behind driver and passenger side of the roof... possibitily of using some electric fans to drive some fresh air in...
Second the weight the weight of Stock harley built Triks already push 1100 1200lbs using their factory engines which i intend to use the built S&S motor, which later in time if successful may consider the investment to upgrade further to the S&S T143 just so i can be pushing close to 150 ft lbs and 160 HP, as linked below. http://www.sscycle.com/files/9714/1444/1300/t143-dyno.PNG? but someone mentioned something about the oddfire causing Pulsing that may actually be one of the biggest concerns i've heard about... |
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