Opinions about exhaust pipe style wanted.

[Tobyjugs]

I am building a bike purely for the track and i have been doing my best to supply as much info as possible to the frame builder so that he can make a good swing arm and linkage system for two pipes exiting one side.

He has showed me a photo of Yogi's bike to try and convince me to have the pipes on each side. My biggest concern is clearance and these pipes will be 120mm diameter at their biggest. My 400cc engined bike has pipes tucked right up out the way and i still managed to deck them on the track the new pipes will be bigger.

Can you all give me some pro's and con's about one pipe each side and two pipe's exiting one side. I don't want to make any mistakes with the construction of the chassis as i have seen enough bodges.

[dusty350]

Mouse had pipes each side that were very big in the mid section. He thinks they were responsible for tipping him off last year when he broke his leg. I much prefer the look of a pipe each side, but aesthetics aren't really an issue on a track bike. Grand prix style would be good if you only ever went round left handers !!

Dusty

[Tobyjugs]

I alos prefer a pipe each side, like you said this is about functionality.

[midlifecrisisrd]

I'd always prefer 1 up each side

With the fat pipes the widest bit will still be under the bike whether gp or 1 each side.

A banana arm will allow you to tuck the silencers higher up.

Steve

[Yogi]

rdlccrazy.proboards.com/post/370851/thread
How about crossovers?
I can virtually lay the bike on its side and they still don’t touch down
Matt

[Tobyjugs]

The reason i think 2 on one side would be good is for chain clearance, but i thought there might be some more reasons

[bare]

Back in the day our Fielded TZ700's.. the two Lower pipes featured a triangular (sort of) section thru their Fat regions,
so as to fit into the Lean angle of the bikes.
To prevent tossing the riders by grounding their pipes :-)

[Tobyjugs]

So at the moment every one seems to be leaning towards two separate pipes instead of GP style.
One member who has raced in the past, told me if you fall off when using normal pipe's you will normally only damage one unless you are unlucky. I thought this was sound advice.

I was searching this site and found another thread on this subject. Guess who posted the thread

[Tobyjugs]

Feb 12, 2018 19:07:41 GMT 1 bare said:

Back in the day our Fielded TZ700's.. the two Lower pipes featured a triangular (sort of) section thru their Fat regions,
so as to fit into the Lean angle of the bikes.
To prevent tossing the riders by grounding their pipes :-)

I was wondering about oval shaped pipes at their biggest size

[4l04ever]

Kenny (TSA) has designed some pipes with thinner bellies to help with clearance on race/track bikes, with similar performance to fat belly pipes.

The only other way is to stagger the fat sections so they are not directly next to each other. The two up one side makes one side better and one side worse.

I have scrapped my right exhaust about 3 times now at Cadwell, so need some different pipes to give more lean angle too....

On an LC, you can lose the centre stand brackets to be able to get the pipes tucked right under. Maybe able to go oval a little, but round is the optimum cross section for maximum area for a specified circumference.

Crossover pipes may move the bellies forward a little, but maybe not enough to make any significant difference.

[Norbo]

Ovel pipes is what you want so you dont loos volume but get more clearance

[lrcarl]

Hi Tony check out the first two pv’s in mad biker brands pictures thread.crossover belly under bike with cone where belly is on conventional pipe
Carl

[Deleted]

Cross Overs for me, like the original TZ350G. It staggers the fat section of pipes and gives the weird but awesome offset end cans. www.rd350lc.net/BROCHURE4LO_TZ350.JPG

I mean look at these tyga-performance.com/images/00psm/07varwsud/28rdpipes/09.jpg

[Tobyjugs]

Hi gents thanks for all your help and suggestions. I've definately got a few ideas after all the suggestions

[mouse]

Hi Tobyjugs

you don't mention which bike this is for. I have a 4LO hybrid (RGV Gull arm), the centre stand brackets have all been cut off and because the shock arrangement is the same as the LC, the pipes (two up one side, GP style) sit right underneath the engine in the centre of the frame, this allows heaps of ground clearance. The only part of the bike that touches down is the side stand bracket on the frame.


I also have a 31k hybrid (RGV swingarm) with one pipe either side and that is a different story! Because of the rear shock arrangement, all the suspension linkages are right where the pipes are fattest and therefore they are pushed out which limits ground clearance (severely, mine touched down and i fell off!) I will be getting a new set of pipes made to cure this problem as soon as poss.

Here you can see where they were touching down!

HTH
Mouse

[Tobyjugs]

Feb 14, 2018 9:52:39 GMT 1 mouse said:

Hi Tobyjugs

you don't mention which bike this is for. I have a 4LO hybrid (RGV Gull arm), the centre stand brackets have all been cut off and because the shock arrangement is the same as the LC, the pipes (two up one side, GP style) sit right underneath the engine in the centre of the frame, this allows heaps of ground clearance. The only part of the bike that touches down is the side stand bracket on the frame.


I also have a 31k hybrid (RGV swingarm) with one pipe either side and that is a different story! Because of the rear shock arrangement, all the suspension linkages are right where the pipes are fattest and therefore they are pushed out which limits ground clearance (severely, mine touched down and i fell off!) I will be getting a new set of pipes made to cure this problem as soon as poss.

Here you can see where they were touching down!

HTH
Mouse

Hi Mouse the bike will be a track bike only. A moto 3 hybrid, still constructing everything. Just want to take into account the pipes whilst building the chassis

[fozzy17]

bought a set of these from Germany

www.ebay.co.uk/itm/YAMAHA-RD350-YPVS-HYBRID/391980045191?hash=item5b43d4d387:g:T0gAAOSw9vlage2d

[jon]

A pipe each side is preferable to me aesthetically.

A crossover will allow the placement of the largest diameter at different positions from front to back and therefore be able to sling them more centrally.

Look at 3XV pipes and you’ll see what I mean.

Putting the largest diameters apart will allow them to be centred as close as possible to the centre of the bike increasing clearance.

Jon

[Tobyjugs]

Feb 14, 2018 21:17:05 GMT 1 jon said:

A pipe each side is preferable to me aesthetically.

A crossover will allow the placement of the largest diameter at different positions from front to back and therefore be able to sling them more centrally.

Look at 3XV pipes and you’ll see what I mean.

Putting the largest diameters apart will allow them to be centred as close as possible to the centre of the bike increasing clearance.

Jon

In which aspect are you talking about cross over? At the front by the down pipes or under the engine as in GP style?

[jon]

I meant crossover at the downpipe.

If the downpipes go forward more than usual then the biggest diameter is also further forward.

If one is more than the other then the main diameters can be slightly staggered an run more down the centre line of the bike giving a bit more clearance.

I’ve seen this on a picture of a Japanese RZ, but can’t remember where.

The 3XV is slightly different, but a similar concept. Have you seen what staggering is on those exhausts due to the vee twin?

Jon

[4l04ever]

There always looks more clearance than there actually is, as the suspension compresses going into corners and everything gets closer to the ground.

[Tobyjugs]

Feb 15, 2018 20:06:01 GMT 1 4l04ever said:

There always looks more clearance than there actually is, as the suspension compresses going into corners and everything gets closer to the ground.

Especially if your a bit heavier like me