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Author Topic: Combining 2 IC Engines  (Read 472 times)

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Offline Mavguy

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Re: Combining 2 IC Engines
« Reply #15 on: April 19, 2017, 01:08:34 PM »
http://classic-motorbikes.net/yamaha-rd700-street-special/

i know the build was detailed on the aircooled rd club site in the forums , i remember reading about it   i'm not an active user anymore but look there. its been done a few times.  :twocents:
Thanks.But there seems to be issues with these websites giving out membership? Seems they are only for UK members....

Offline m in sc

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Re: Combining 2 IC Engines
« Reply #16 on: April 19, 2017, 01:09:36 PM »
im not in the uk and i was on there for along time.
get off my lawn.

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Offline hw9rd350b

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Re: Combining 2 IC Engines
« Reply #17 on: April 19, 2017, 03:40:24 PM »
kind of the same- water cooled..
https://www.youtube.com/watch?v=MDpJ-BbxTn0

If I were to attempt such a project I would do a V 4. Might be easier to attempt, gear drive the cranks like a RZ500.


JT
« Last Edit: April 19, 2017, 03:46:48 PM by hw9rd350b »
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Offline m in sc

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Re: Combining 2 IC Engines
« Reply #18 on: April 19, 2017, 04:53:55 PM »
ive looked at doing both, doing an inline i think would be easier  look at the millyard kawasakis. however his v-twin sl honda is a fucking riot. 
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Offline sav0r

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Re: Combining 2 IC Engines
« Reply #19 on: April 19, 2017, 05:26:25 PM »
I think you could do an inline setup fairly cheaply. You'd lop off the transmission from one case, run chain from one crank to the other, probably on the alternator side, then hook up some hall effect sensors for ignition. If you can do the work yourself and have the parts on hand it could be done dirt cheap. It would be heavy, under powered, but extremely cool.

I'm doing an inline 3 cylinder right now. Three cranks, two turning one way, the other turning backwards (gear driven obviously). They will be at 120 degrees firing order, the cylinders are horizontally opposed, two on one side with one on the other. Unfortunately I have to move next month so work ground to a halt about a month ago. I have wax ready to do test runs on the crank case. I own 6 motors that I will be using the cylinders, cranks, rods, pistons, reed cages, and carburetors from. I will machine the cases myself. I already have the tooling. It will cost around $125 for the raw aluminum for the cases. I have $40 in wax to do the test runs. Of course that uses $6k worth of engine parts from a decade ago, but they are valueless now, so why not put them to use? So if you have a pile of RD parts floating around I say go for it.
« Last Edit: April 19, 2017, 05:28:04 PM by sav0r »
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Offline Zedixe13

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Re: Combining 2 IC Engines
« Reply #20 on: April 19, 2017, 08:35:33 PM »
1979 1980 1981 1982 1984 1985

Offline z1 zonly

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Re: Combining 2 IC Engines
« Reply #21 on: April 20, 2017, 08:12:11 AM »


           RD400F               |               RD350B              |               RD350/H1                  |              SXV550 (for sale)

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Offline Mavguy

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Re: Combining 2 IC Engines
« Reply #22 on: April 20, 2017, 10:31:50 AM »

SWEET!!!
can we get pics  inside of the crankcase??any work needed there.....especially to fit in the crank assembly......

Offline z1 zonly

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Re: Combining 2 IC Engines
« Reply #23 on: April 20, 2017, 02:58:46 PM »
Not mine, and unfortunately that's the only pic I can find of it.


           RD400F               |               RD350B              |               RD350/H1                  |              SXV550 (for sale)

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Offline yamman

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Re: Combining 2 IC Engines
« Reply #24 on: April 21, 2017, 06:37:05 AM »
Always good to see such projects! :P  I think one method that worked well was the 3 cylinder, with the extra cylinder on the LHS.  Yes, it pokes out a bit but, it works and everything else stays the same!  :P

Yamman

Offline Mavguy

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Re: Combining 2 IC Engines
« Reply #25 on: April 21, 2017, 06:35:12 PM »
Always good to see such projects! :P  I think one method that worked well was the 3 cylinder, with the extra cylinder on the LHS.  Yes, it pokes out a bit but, it works and everything else stays the same!  :P

Yamman
Will keeping the engine in its current place and adding 2 cylinders on the LHS (like the Banshee 4 ) cause any issues with balance, stability etc......?

Offline jspooner

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Re: Combining 2 IC Engines
« Reply #26 on: April 21, 2017, 08:59:32 PM »
Take two complete top ends and a comlete crankshaft and hang it on the left side of your bike somehow and then come back and tell us what it feels like..........of course you'll be able to tell. One wouldn't be bad obviously because it's been done successfully, add about 8 more inches and what........about 30 more pounds?
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Offline Mavguy

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Re: Combining 2 IC Engines
« Reply #27 on: April 21, 2017, 09:35:56 PM »
Take two complete top ends and a comlete crankshaft and hang it on the left side of your bike somehow and then come back and tell us what it feels like..........of course you'll be able to tell. One wouldn't be bad obviously because it's been done successfully, add about 8 more inches and what........about 30 more pounds?
To make. It simple..... What and how to work the chassis for this...

Offline sav0r

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Re: Combining 2 IC Engines
« Reply #28 on: April 21, 2017, 11:06:37 PM »
If you are capable of extending a crank and mating crankcases you are equally capable of modifying a simple tube frame.
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Offline Mavguy

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Re: Combining 2 IC Engines
« Reply #29 on: April 21, 2017, 11:48:53 PM »
If you are capable of extending a crank and mating crankcases you are equally capable of modifying a simple tube frame.
Yes but any pitfalls I need to avoid.