The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: Russ on 09.04. 2020 23:26

Title: Fill in the blanks, muffler measurements
Post by: Russ on 09.04. 2020 23:26

Attached is a photo of a home made muffler I intend to use on my 51, A10 Plunger.
Can someone please give me the two measurements as shown from an original muffler so I can check that mine will fit correctly.
Cheers Russ

Title: Re: Fill in the blanks, muffler measurements
Post by: RichardL on 10.04. 2020 04:03

You made that?! Awesome.

Title: Re: Fill in the blanks, muffler measurements
Post by: Miker on 10.04. 2020 05:58

Hi, Hope this helps. These are the measurements from my muffler (after market) but see if you get other responses  to see if they match.
Cheers *smiley4*

Title: Re: Fill in the blanks, muffler measurements
Post by: Beeza on 10.04. 2020 08:24

Hi Russ, I had some mufflers made for my plunger, and they are 670mm and 290mm.
We did not have an original to copy though, hope this helps.
Cheers Thomas

Title: Re: Fill in the blanks, muffler measurements
Post by: Greybeard on 10.04. 2020 10:11

I'll measure my after market silencers when I get dressed.

Title: Re: Fill in the blanks, muffler measurements
Post by: Greybeard on 10.04. 2020 10:14

Quote from: Russ on 09.04. 2020 23:26

Attached is a photo of a home made muffler I intend to use on my 51, A10 Plunger.
Can someone please give me the two measurements as shown from an original muffler so I can check that mine will fit correctly.

But, amazingly, you've made it. What are you going to do if it's wrong?

Title: Re: Fill in the blanks, muffler measurements
Post by: Russ on 10.04. 2020 11:40

OK guys settle down. I DID NOT make these mufflers. I don't have the skills.
They came with the project bike I bought many years ago. The old chap who made them no longer makes parts for BSA's which is a loss.
I want to check that my mufflers will fit with "store bought" header pipes should I need to purchase them. I have header pipes that need to be re-shaped to fi,t then chromed, which may be an expensive option.
Thank guys for your reply's. I will  check your measurements against mine to see if mine are in the ball park.

Cheers Russ

Title: Re: Fill in the blanks, muffler measurements
Post by: Greybeard on 10.04. 2020 17:04

I just remembered to go and measure my mufflers/silencers. I love a bit of muff-diving, me!
In English, the measurements are as follows.
 
Drive side:
A = 23 7/16". B = 8 1/16"
Timing side:
A = 24 1/8" .  B = 8 3/4"

The difference is explained by the fact that I had to buy a replacement silencer after one developed a loose baffle and started to buzz loudly at certain revs.

The downpipes I have go a long way into the silencer, maybe 4 inches. I don't know if that matters. The exhaust sounds quite nice and throaty though!

Additional: The place where the stand foot sits on your silencer is much nicer than mine, which are just dented depressions.

Title: Re: Fill in the blanks, muffler measurements
Post by: RDfella on 10.04. 2020 19:31

Dunno about the diving, Neal. I see I have a couple of years on you, but I gave all that up quite a while ago. All in the mind now.

Title: Re: Fill in the blanks, muffler measurements
Post by: Greybeard on 10.04. 2020 19:50

Quote from: RDfella on 10.04. 2020 19:31

Dunno about the diving, Neal. I see I have a couple of years on you, but I gave all that up quite a while ago. All in the mind now.

I have a good memory!  *smile*

Title: Re: Fill in the blanks, muffler measurements
Post by: Russ on 10.04. 2020 23:20

Thanks for posting the dimensions guys, very helpful and much appreciated.