 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?
Thanks |
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| JOEPROPER |
Mar 5 2016, 09:18 AM
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#2
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The answer is "no" unless you ask... Group: Members Posts: 1,184 Joined: 21-November 15 From: White Plains New York Member No.: 19,387 Region Association: North East States 
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QUOTE(gunn1 @ Mar 5 2016, 10:13 AM)  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? Thanks I think torque would be a problem if using a motorcycle engine not to mention that many of those engine make power above the 12,000 rpm mark. |
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| Tbrown4x4 |
Mar 5 2016, 09:26 AM
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#3
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Senior Member Group: Members Posts: 703 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None
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I've seen videos of a Fiat X 1/9 hillclimber with a Hyabusa engine. Fast as hell and really screams. No sure I'd want to sit in traffic with it though.
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| Mark Henry |
Mar 5 2016, 09:36 AM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(gunn1 @ Mar 5 2016, 10:13 AM) What am I missing? Torque. |
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| bandjoey |
Mar 5 2016, 09:44 AM
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#5
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bandjoey Group: Members Posts: 4,923 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
Do a search and you'll find a few threads. All talk about no torque for a driver
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| Andyrew |
Mar 5 2016, 09:49 AM
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#6
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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Well my setup is being built to rev to 8250 reliably... I mean sure on race gas I'll be shooting for 500+, but my street tune will probably be over 400 and my mountain tune between 250 and 300....
The biggest issue with a street bike engine is very few of them have over 75lbs of torque and ONLY at way high RPM's. When driving around town under say 5k rpm's you only have a tiny amount of torque available which makes driving around town either a chore or it makes you FEEL like you have to rev the piss out of it to drive it anywhere.. |
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| tomrev |
Mar 5 2016, 11:13 AM
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#7
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Member Group: Members Posts: 231 Joined: 25-February 14 From: N. Mich. Member No.: 17,037 Region Association: None |
Torque yes, but don't forget bikes don't have reverse, so you have to adapt a cheesy starter motor/gear reduction thing if you want it. They do rev like mad, and sound cool, but after building one, I actually re-converted it to a type 4 Supervee/Hewland I had built.
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| Hank914 |
Mar 5 2016, 11:32 AM
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#8
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Member Group: Members Posts: 389 Joined: 7-April 14 From: CA and OR Member No.: 17,215 Region Association: None |
"There are dozens of possible alternatives currently being housed in various motorcycle brands. What am I missing?"
My initial thought was..."motorcycle brands"..., oh, like Honda or Suzuki car engine swaps. Sorry, but still think of those cars as "motorcycle brands". I guess my brain was not thinking enough outside of the box. (Need more coffee). What about a Harley swap? |
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| tomrev |
Mar 5 2016, 11:35 AM
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#9
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Member Group: Members Posts: 231 Joined: 25-February 14 From: N. Mich. Member No.: 17,037 Region Association: None |
[quote name='Hank914' date='Mar 5 2016, 09:32 AM' post='2311586']
"There are dozens of possible alternatives currently being housed in various motorcycle brands. What am I missing?" My initial thought was..."motorcycle brands"..., oh, like Honda or Suzuki car engine swaps. Sorry, but still think of those cars as "motorcycle brands". I guess my brain was not thinking enough outside of the box. (Need more coffee). What about a Harley swap? It will sound like a low revving slug. |
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| Mark Henry |
Mar 5 2016, 11:58 AM
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#10
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
If you look at the typical T4 or /6 build, the torque and Hp (number) are still fairly close to each other. With the T4, stock or performance, it's damn near the same number.
In fact for the street I say the torque is the more important number. |
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| messix |
Mar 5 2016, 12:47 PM
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#11
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
lots of info here dispels some of the myths
http://www.motoiq.com/MagazineArticles/ID/...e-Thinking.aspx |
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| jd74914 |
Mar 5 2016, 02:17 PM
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#12
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
You're really transmission limited. Acceleration is a function of tractive force which is a function of transmission output torque. You just need a transmission geared for the engine you want and you'll be good to go. The stock bike transmission really isn't geared correctly for our application, but if you had more car-friendly gear ratios it could work. In the Miata link they remove the bike transmission from the equation altogether to solve that problem.
The Miata build link is super cool, thanks! |
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| Cracker |
Mar 5 2016, 03:57 PM
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#13
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States
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No it wouldn't be a good fit. No, we haven't forgotten that there are light weight engines out there (that wouldn't be a good fit). You are missing quite a bit. Have you ever driven a car powered by a bike motor?
Tony QUOTE(gunn1 @ Mar 5 2016, 10:13 AM) 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? Thanks |
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| Gunn1 |
Mar 5 2016, 06:14 PM
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#14
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Senior Member Group: Members Posts: 1,021 Joined: 14-February 16 From: Minnesota Member No.: 19,670 Region Association: None |
QUOTE(Cracker @ Mar 5 2016, 03:57 PM) No it wouldn't be a good fit. No, we haven't forgotten that there are light weight engines out there (that wouldn't be a good fit). You are missing quite a bit. Have you ever driven a car powered by a bike motor? Tony QUOTE(gunn1 @ Mar 5 2016, 10:13 AM) 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? Thanks Hey chill out Uncle Cracker......I asked the question because I didn't know, and hadn't seen this type of conversion. |
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| Gunn1 |
Mar 5 2016, 06:16 PM
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#15
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Senior Member Group: Members Posts: 1,021 Joined: 14-February 16 From: Minnesota Member No.: 19,670 Region Association: None |
What about something Boxer or in "V" configuration.
Honda Goldwing, BMW, ect |
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| whitetwinturbo |
Mar 5 2016, 07:37 PM
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#16
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Honey, does this wing make my ass look fat? Group: Members Posts: 1,391 Joined: 22-October 11 From: Newport Beach/Kalefornya/USA Member No.: 13,704 Region Association: Southern California |
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| Cracker |
Mar 5 2016, 08:08 PM
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#17
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States
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(IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/shades.gif)
"Uncle" Cracker (Kind of like the sound of that...how do you change one's UN?) PS: You never answered my question young'n... Tony |
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| Gunn1 |
Mar 5 2016, 08:14 PM
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#18
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Senior Member Group: Members Posts: 1,021 Joined: 14-February 16 From: Minnesota Member No.: 19,670 Region Association: None |
QUOTE(Cracker @ Mar 5 2016, 08:08 PM) (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/shades.gif) "Uncle" Cracker (Kind of like the sound of that...how do you change one's UN?) PS: You never answered my question young'n... Tony Nope |
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| Cracker |
Mar 5 2016, 08:26 PM
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#19
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States
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I'll take that as you have no experience...here is my 4-stroke, bike-powered P1 prototype. This car weights 850 pounds wet. A light 914 with a bike motor would still be twice that - there is absolutely no way, no how it would make for a good power plant for a 914 conversion. The bikes transmission and clutch are already challenged at my cars weight. I have to slip the clutch quite heavily just to get moving - not good for any street driven vehicle (anyway). I'm sorry I was so hard on you, being new and all. Welcome to the World.
(IMG:style_emoticons/default/beerchug.gif) Tony "Uncle" Cracker QUOTE(gunn1 @ Mar 5 2016, 09:14 PM) Nope  |
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| messix |
Mar 5 2016, 10:52 PM
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#20
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
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