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Bike cans
the man with a plan - 15/6/04 at 09:52 PM

Hi,

I understand some people use bike cans for the exhaust, are they alredy heat shielded, or do the require an extra one as described in the book?

[Edited on 15/6/04 by the man with a plan]

alister667 - 15/6/04 at 10:09 PM

Just about any exhaust (bike or made for BEC) you use will build up enough heat to burn you if you're not careful. It's a matter of choice wether you fit a heatshield or use common sense to stay out of the way of the thing.
I haven't seen any of the BEC exhausts come with a heat shield. You could make one fairly easy though.
I'm relying on a stern warning to passengers (on a blade its on the passenger side). It's been through MOT and the SVA guy never mentioned it either. The only problem, off the top of my head, with a bike can is getting the sound levels low enough.

SeaBass - 15/6/04 at 10:26 PM

Couple of issues here man w a p as far as I can see.

There is nothing in the SVA manual concerning requirement for an exhaust heat shield. This does not mean that an examiner can pick you up about it under design & construction section.

Second not all bike cans will sound level test at SVA.

Cheers

the man with a plan - 15/6/04 at 11:58 PM

Thanks for the info guys.

I'm planning on using a Megasquirt ECU that should allow me to fully adjust the fuel map so i can sort out my emissions and sound for sva, then alter it after for power!

spunky - 16/6/04 at 09:19 AM

I will keep mentioning this, as I have learnt to my cost.
Fill in SVA application stating peak power is 7500rpm. Test will be carried out at 5000rpm which is the level that production bikes are tested at for noise. Even my SP1 was 98dB at 5K on short open pipes.

John

alister667 - 16/6/04 at 09:36 PM

quote:
Originally posted by SeaBass
Couple of issues here man w a p as far as I can see.

There is nothing in the SVA manual concerning requirement for an exhaust heat shield. This does not mean that an examiner can pick you up about it under design & construction section.

Second not all bike cans will sound level test at SVA.

Cheers


Actually I *think* heat shields are mentioned in the SVA. The mention that where an exhaust goes outside the line of the car body/wheels (like on a Cobra) it does require a heatshield. I think most testers would look at that and assume that if the exhaust stays inside the line of the body (as on most Sevens) it doesn't require a heatshield. Mind you this is all from from memory as I can't be arsed to get up and check it out of the book

Ultimately though Seabass is right. Any SVA inspector can fail your car for just about any reason they want. To be fair no heats shield makes more sense than "your steering wheel is too big" and "your seat isn't adjustable". I've had both of these thrown at me.

All the best

Ali

Tigger - 19/6/04 at 04:49 PM

Another thing to bear in mind on bike cans is the radius on the exhaust exit.
It has to be radiused too.

I have a bike can from an R1 and it passed on 99db - Phew!

Mind you I did pack it a bit with some wire wool which blew out on the way home - lol

Tigger