 High Revv, Light Weight, What am I missing?/Different type of Conversion |
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| Gunn1 |
 Mar 5 2016, 09:13 AM
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#1
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Senior Member  Group: Members Posts: 1,021 Joined: 14-February 16 From: Minnesota Member No.: 19,670 Region Association: None  |
With all of the talk about light weight, high horsepower replacement engines for our favorite Porsche, have we forgotten all of the lightweight, high revving 4 strokes out there? There are dozens of possible alternatives currently being housed in various motorcycle brands. Are there any working examples of this type conversion out there? Thinking besides the lightweight, they tend to be compact and have smaller cooling, electrical and mechanical systems. Would seem using one for a conversion would be a no brainer. What am I missing?
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| roblav1 |
Mar 16 2019, 05:44 PM
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#2
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
It seems I'm on the opposite page than almost everyone here. I've always believed a M/C engine in a 914 would be great. I've built SCCA formula cars with Hayabusa, Yamaha R1, and Gen 5 Kawasaki ZX-10R. The comments about lacking torque and poor gearing are nonsense. You can easily change either (or both) sprockets to get the RPMs where you want them. So take away 350 lbs from an engine and 100 or so lbs for the transaxle / clutch. My R1 was 142 lbs complete and Kawi at 150 or so lbs. Quaife limited slip chain drive differentials have been out there for a long time, and no probs bolting up CV's or tripods. We thrash these engines like crazy. As long as you have good oil flow and the oil temps aren't too high, they run and run. An oil/water heat exchanger does wonders. I almost did this on my last 914 with leftover parts I had laying around, but I went a completely opposite direction with a 993 engine. I still debate doing the M/C engine thing, even with my present project.
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| SirAndy |
Mar 16 2019, 06:01 PM
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#3
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Resident German Group: Admin Posts: 41,677 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(roblav1 @ Mar 16 2019, 04:44 PM)  You can easily change either (or both) sprockets to get the RPMs where you want them. How does changing a sprocket change at what rpm the engine makes peak power/torque? It's been a while since i was into (dirt) bikes but i'm pretty sure changing sprockets only changes how fast (or not) you get to peak rpm. You'd still have to drive around town at 10000 rpm to get a 914 with you in it to move ... (IMG:style_emoticons/default/confused24.gif) |
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Posts in this topic
gunn1 High Revv, Light Weight Mar 5 2016, 09:13 AM
JOEPROPER
With all of the talk about light weight, high hor... Mar 5 2016, 09:18 AM Tbrown4x4 I've seen videos of a Fiat X 1/9 hillclimber w... Mar 5 2016, 09:26 AM Mark Henry
What am I missing?
Torque. Mar 5 2016, 09:36 AM bandjoey Do a search and you'll find a few threads. All... Mar 5 2016, 09:44 AM Andyrew Well my setup is being built to rev to 8250 reliab... Mar 5 2016, 09:49 AM
tomrev Torque yes, but don't forget bikes don't h... Mar 5 2016, 11:13 AM Hank914 "There are dozens of possible alternatives cu... Mar 5 2016, 11:32 AM tomrev [quote name='Hank914' date='Mar 5 2016... Mar 5 2016, 11:35 AM Mark Henry If you look at the typical T4 or /6 build, the tor... Mar 5 2016, 11:58 AM messix lots of info here dispels some of the myths
http... Mar 5 2016, 12:47 PM jd74914 You're really transmission limited. Accelerati... Mar 5 2016, 02:17 PM Cracker No it wouldn't be a good fit. No, we haven... Mar 5 2016, 03:57 PM gunn1
No it wouldn't be a good fit. No, we haven... Mar 5 2016, 06:14 PM gunn1 What about something Boxer or in "V" con... Mar 5 2016, 06:16 PM whitetwinturbo ....TORQUE THIS :woohoo:
https://www.youtube.co... Mar 5 2016, 07:37 PM Cracker :poke: :poke: :poke: :shades2:
"Uncle... Mar 5 2016, 08:08 PM gunn1
:poke: :poke: :poke: :shades2:
"Uncl... Mar 5 2016, 08:14 PM Cracker I'll take that as you have no experience...her... Mar 5 2016, 08:26 PM messix myth busted
https://www.youtube.com/watch?v=JGvL... Mar 5 2016, 10:52 PM Mueller
myth busted
[url=https://www.youtube.com/watch?... Mar 5 2016, 11:19 PM thelogo Its all about usable power
But the engine i wo... Mar 5 2016, 11:14 PM Mueller
Its all about usable power
But the engine i w... Mar 5 2016, 11:22 PM Cracker The problem is with allot of bike motors, the tran... Mar 6 2016, 06:51 AM DBCooper Ever seen the connecting rod of a Cummins big truc... Mar 6 2016, 09:37 AM whitetwinturbo Joy you say you want...........here's a flying... Mar 6 2016, 11:06 AM ClayPerrine Back when I was fixing cars for a living, I had on... Mar 6 2016, 12:10 PM KELTY360
Back when I was fixing cars for a living, I had o... Mar 6 2016, 12:28 PM ThePaintedMan :agree: Even in the SCCA DSR/P2 class, where the c... Mar 6 2016, 12:22 PM Cracker The best engine I could see being used in a 914, s... Mar 6 2016, 01:52 PM tomrev http://www.tomsgarage.com/files/lo12_035.JPG
... Mar 6 2016, 02:00 PM Craigers17 I realize this is an older post and I'm not tr... Mar 16 2019, 11:21 AM thelogo The mod your looking for is a rotary or wankel eng... Mar 16 2019, 12:00 PM Rand The tranny made for a bike can't handle the we... Mar 16 2019, 01:28 PM sixnotfour https://orangecounty.craigslist.org/cto/d/w...6841... Mar 16 2019, 02:10 PM SirAndy 1976 Porsche 914 with a 2006 Suzuki Hayabusa 1300 ... Mar 16 2019, 02:17 PM Cracker I have a bike powered car and it would be terrible... Mar 16 2019, 07:34 PM sixnotfour
:beer2: :bump: Mar 16 2019, 07:43 PM roblav1 You could drive around town at 5-6000 RPM but woul... Mar 16 2019, 08:54 PM sixnotfour Well, it does run...914
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