Exhaust pipe lengths

[Lynn Eades]

Hi, Can some one please advise the correct lengths to cut the under floor straight exhaust tubes to.
One is longer than the other. Thank you in advance.

[Ben]

Hi Lynn

Trial and (no) error will be your best bet. I ordered over long sections, put the floor elbow and muffler on the hull measure the gap and add on the parallel section from the elbow and muffler ends. You should get a nice snug fit this way.

I suspect if someone gives you a number it could vary between muffler manufacturer and the sands of time letting things move around.

Ben

[rob love]

Concur 100%. Make everything long by a foot. One problem in particular that I found was that often the inlet/outlet of my mufflers are timed just in one way. I would turn the muffler to wherever would give me the proper positioning of the outlet pipes, so they would fit in the top deck cut outs. Then I do what is necessary to make the bottoms meet up with the straight pipes.

All this is assuming you do not have left and right NOS mufflers.

[RichardT10829]

As per Ben and Rob I fitted my pipes into the cast floor nuckles the mounted the cans and marked off where the straight lengths needed to be cut. For the sake of a couple of bolts it made a good job of it.

I used stainless Dairy pipe for mine.

[Lynn Eades]

Thanks guys. I will move ahead with caution.
While we're here, Any suggestions for insulation to replace the asbestos panels at the rear........ or can I get away with not fitting any thing?
What about just a plain panel steel baffle spaced from the hull plate?

[Ben]

I used woven welding Matt, identical to the asbestos but without the hassle. Email me if you need any.

[Andrew Rowe]

Hi Lynn, I may have an original one to measure, will check tomorrow for you.
I take it English and Canadian ones are the same? Is that hardy board any good for the heat shield??,
looks like the same construction as the original stuff, but without the bad stuff in it. I thought builders
used it around fireplaces in houses at times, and it is about 5mm thick.

[RichardT10829]

Ben is it Pro mat ? I need to make some fake asbestos shields for the inside of the engine covers

[Andrew Rowe]

The two lengths are 970mm and 1000mm. This is allowing 40mm into the elbow by the engine and 60mm sleeving into the bend that goes into the bottom of the muffler. This was measured off what appears to be original pipes I have with the original mufflers or what's left of them , and their bends,
hope that gives you some ideas.

[Lynn Eades]

Has anyone put a gasket between the floor and the exhaust elbows?

[rob love]

I don't bother. They were there originally, but I cannot see them serving any purpose.

[Lynn Eades]

Hi Rob, I was just wondering if it might reduce the local heat in the floor there. Thank you for your input all the same.

[rob love]

I suppose it could stop the floor from warping with the heat, which might cause the pipes to bind a little at the flex joint. But the engineers who designed it had things like desert use on their minds. The worst I'll do is a short run on a 30° day.