1987 3.2 Carrera Backdate project - Sladeys hotrod

Nige · Post by **Nige** » Mon Jan 04, 2010 10:22 am

Good stuff Mark, I guess if the droning is too loud to bare you could try wrapping it.

Way better than the old lash up!

sladey · Post by **sladey** » Mon Jan 04, 2010 10:29 am

Thanks Mr P - I'm over the moon with the look of it, and I'm sure I'll get used to the sound - I've no doubt that on full chat it will be the absolute dog's - it's just pootling along in traffic needs to be bearable as I end up doing that quite a bit every day.

I reckon I'll be able to tweak/play with the single-out sound anyway - maybe with inserts inside the pipe. Want to let it settle down a bit first though

Am doing a thread on the install on IB and will also post it onto the tech articles here on DDK

sladey · Post by **sladey** » Mon Jan 04, 2010 10:30 am

Nige wrote:Good stuff Mark, I guess if the droning is too loud to bare you could try wrapping it.

Way better than the old lash up!

None taken Nige!

Yes - I did think of wrapping - will see how it goes

911hillclimber · Post by **911hillclimber** » Mon Jan 04, 2010 12:36 pm

If wrapping the silencer I doubt it will tolerate the general weathering it will get in the location.

I have had wrapping on various cars, and it deteriorates quicker than you imagine.
Every aftermarket exhaust I've had droned at '70' and in the end it drives you mad.

Gary71 · Post by **Gary71** » Mon Jan 04, 2010 12:50 pm

Looks good Mark,

It may settle as the inside gets coated with all the crap your car puts out!

If not get some earplugs...

sladey · Post by **sladey** » Mon Jan 04, 2010 3:01 pm

That's a good point about the wrapping breaking down - I could see that happening quickly

Went to my Mum's at lunchtime - it seems to be sounding better as I drive it more. The engine also seems to have lost a bit of torque but gained bigger lungs - that's what it feels like.

The sound is starting to be glorious.

One thing that occurs to me is that the back box is strapped to the rear of the engine - a metal to metal contact - if I could find an insulating material I could make up a couple of pads to stop that sound transfer (if any is coming from that region) - any idea on what I could use for the pads? I'm looking to create two two inch square pads

Nige · Post by **Nige** » Mon Jan 04, 2010 3:20 pm

Provided its proper tight I doubt any volume would reduce other than vibration which if the straps are tight enough its shouldn't happen. Remember the whole thing is bolted to the cylinder head ports so its never going to be isolated from metal to metal of the engine. I'd use exhaust wrap around the mounts to give it a go if you wanna!

Mike Usiskin · Post by **Mike Usiskin** » Mon Jan 04, 2010 3:42 pm

you big girls blouse

be loud and proud

M

sladey · Post by **sladey** » Mon Jan 04, 2010 4:01 pm

Thanks Mr "I live in london and only drive my car once a year and when I do drive it I have to crash it to get some new wings" Usiskin

sladey · Post by **sladey** » Mon Jan 04, 2010 4:08 pm

Nige wrote:Provided its proper tight I doubt any volume would reduce other than vibration which if the straps are tight enough its shouldn't happen. Remember the whole thing is bolted to the cylinder head ports so its never going to be isolated from metal to metal of the engine. I'd use exhaust wrap around the mounts to give it a go if you wanna!

I reckon if you think of the sound waves as a load of balls bouncing around - they are going to be moving in the same direction in the header pipes, but when they get to the muffler they'll be knocking about against each other and making noise.

Also if you put your head against another person's (preferably female) head and then get them to make a noise you hear it inside your head before your ears pick it up.

So having learned my physics from Blue Peter and John Cravens newsround I reckon that some of the noise will be coming from that link - anyway it wont' take too long to try it out

Nige · Post by **Nige** » Mon Jan 04, 2010 4:34 pm

You're wasted as a solicitor type, I think you'd give that Hawkins fella a run for his money (no pun intended) in a 'Boffin Off'

sladey · Post by **sladey** » Mon Jan 04, 2010 5:03 pm

next week I'll be mostly doing rocket surgery

MrPerkles · Post by **MrPerkles** » Mon Jan 04, 2010 9:05 pm

padding the exhaust to where it touches the engine mount reduces noise on an m&k considerably ask Northy and that bloke Perky
Nigel stick to knitting it suits you better

sladey · Post by **sladey** » Mon Jan 04, 2010 11:26 pm

Thanks Monseur Peh

sladey · Post by **sladey** » Mon Jan 04, 2010 11:28 pm

Mike Usiskin wrote:now you're talking Mark love to hear the exhaust, I always new you were jealous I can't wait to get mine back! I think I'm going to fit some new seats and then maybe......maaybe "Sladey Stripes (TM)"

What seats you thinking of Mike?

Got my eye on these

Linky link