Two engines to make one?
Moderator: DLRA
Two engines to make one?
Hi
I'm new here. I don't have a dlra rule book yet but have been researching all I can and reading the bonneville regulations I have access to.
I'm hoping someone can help me understand and intereperet...
If I use two single cylinder motorcycle engines to make one twin cylinder engine running through one gearbox, is that considered "multiple engines"?
Thanks
JP
(Sorry if it's obvious, it's not to me)
I'm new here. I don't have a dlra rule book yet but have been researching all I can and reading the bonneville regulations I have access to.
I'm hoping someone can help me understand and intereperet...
If I use two single cylinder motorcycle engines to make one twin cylinder engine running through one gearbox, is that considered "multiple engines"?
Thanks
JP
(Sorry if it's obvious, it's not to me)
Re: Two engines to make one?
Perhaps you could start by looking at other members running two engines. Another member of the DLRA is running to Sidevalve V8's coupled together.
Member DLRA 112.
Re: Two engines to make one?
Sounds interesting, but I don't think it would help me understand if I can make a twin motorcycle engine out of two single cylinder engines and have it considered as one engine?
Re: Two engines to make one?
The only point I was trying to make for you is that it does fit into the DLRA rules. Hopefully some of the Bike guys will post a reply for you.
Member DLRA 112.
Re: Two engines to make one?
Ok , the way you are explaining what you are doing , there are 2 crankshafts ? One connected to a gearbox
Sounds like 2 engines to me , A class , special construction
May be more info on what you have in mind , and the class you think or would like to run in
harky
Sounds like 2 engines to me , A class , special construction
May be more info on what you have in mind , and the class you think or would like to run in
harky
harky
DLRA #643
so far 120mph for$2000---imagine how fast I can go for $20,000
DLRA #643
so far 120mph for$2000---imagine how fast I can go for $20,000
Re: Two engines to make one?
Two engines running through one gearbox is still two engines. Regardless if they are configured side by side or one behind the other.
Two barrels (single cylinders) sharing the same crankcase is one engine.
Two barrels (single cylinders) sharing the same crankcase is one engine.
Keep the shiney side up........
DLRA WebMaster / Editor
DLRA WebMaster / Editor
Re: Two engines to make one?
Thanks for all the replies.
The concept is a two stroke, two cranks joined together inline, two crank cases modified into one.
Does that sound like a single engine?
Thanks for input
The concept is a two stroke, two cranks joined together inline, two crank cases modified into one.
Does that sound like a single engine?
Thanks for input
- gennyshovel
- Posts: 866
- Joined: Tue Mar 29, 2005 10:10 am
- Location: Broken Hill
Re: Two engines to make one?
It sure sounds like "one engine" to me ,,Arial square fours had 2 cranks, coupled by gears.barra wrote:Thanks for all the replies.
The concept is a two stroke, two cranks joined together inline, two crank cases modified into one.
Does that sound like a single engine?
Thanks for input
You cant be in modified (M), and special construction(A) with one vehicle, drop the M,,,,,,
My TwoBobs worth
Tiny
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering
Postiebike Racing , created & funded by TwoBob Engineering
Re: Two engines to make one?
That is great clarification and I had not considered it that way.DLRA wrote:Two engines running through one gearbox is still two engines. Regardless if they are configured side by side or one behind the other.
Two barrels (single cylinders) sharing the same crankcase is one engine.
Member DLRA 112.
Re: Two engines to make one?
That's what I thought and was hoping.
How would I go about clarifying for sure?
Maybe I got the class wrong. But I do want to run modified frame, rather than special construction.
Thanks again for the insight
How would I go about clarifying for sure?
Maybe I got the class wrong. But I do want to run modified frame, rather than special construction.
Thanks again for the insight
Re: Two engines to make one?
Does the fact the engine is so customised make it special construction?
I'm confident I can use a factory frame from the same manufacturer modified within the restrictions of modified frame class.
I'm confident I can use a factory frame from the same manufacturer modified within the restrictions of modified frame class.
Re: Two engines to make one?
The engine as well as the frame will put you in a specific class. Engine is non standard.
Member DLRA 112.
- AuotonomousRX
- Posts: 729
- Joined: Wed Jan 06, 2010 10:05 pm
- Location: Eyre Peninsula SA
Re: Two engines to make one?
I think you have just answered your own question ..... It sounds like you are going to couple two separate engines and then through one gearbox like this ... It would be hard to argue that this is not two engines ...barra wrote:"If I use two single cylinder motorcycle engines to make one twin cylinder engine running through one gearbox, is that considered "multiple engines"?
7.F MODIFIED PRODUCTION- M, MPS .....
A single engine with maximum displacement limited to 3000cc.
If you went to the trouble of casting a crankcase and then coupling the two cranks together like a Rotax Based Superkart engine Pic 1 or an Aprilia V Twin GP250 engine Pic 2 you might be able to argue it was one engine .....
But I think even doing that, based on this from Modified Class rules, puts you in Special Construction as you would have to modify the Frame to fit this sort of custom engine .....
7.F MODIFIED PRODUCTION- M, MPS .....
Perimeter type frame engine cradle tubes must remain unmodified.
Spar-style main frame spars must remain unmodified. “Main frame spars” are defined as the large formed tubes which connect the steering neck to the engine mounts and swing arm pivot.
The engine shall be from the same manufacturer as the frame.
A single engine with maximum displacement limited to 3000cc.
A maximum wheelbase not to exceed the original OEM specification plus 10%. Entrants shall provide acceptable documentation for record certification.
You really need to download the Rule Book and contact our Chiel Motorcyle Inspector Graham Hadley .... motorcycle.steward@dlra.org.au and send him the info on your plans, drawings and pictures make it easier to show exactly what you plan to do ....
Pete
Still trying to decide if I am a procrastinator
Pete
DLRA #866
Pete
DLRA #866