Okay, i baught one of those 6 dollar 6" Drubro muffler extension for my sk 90. I needed about an inch to clear the muffler from the fuse. Anyway, after a long afternoon and a trip to the local hardware store i finally got it to work. I have got a few questions

1. The dimensions of the engine's exhaust port are 28mm and 9 mm. The muffler extension I have is 30mm by 8 mm. Will 1 mm thinner port make any difference.
2. I have got the cut as close as i can get without a machinist doing the job for me. There is still i very slight gap on the cut side and when i blow through the exhaust there is a slight amount of air that seeps out around the manifold. Is it necessary to fix this and if so could i get some sort of sealent to put between the gap.

Thanks
Cameron

http://www2.towerhobbies.com/cgi-bin...?&I=LXD621&P=7

The mismatch on the exhaust won't really make much difference, the port is plenty
wide enough for satisfactory flow, and the engine isn't a high RPM screamer anyway.

There are other high temperature sealers on the market, but the black Permatex is
the best for really high temps, so why not use the best. It is specified for applications
on exhaust manifolds that do not use gaskets.

FBD.

Thanks Flyboy dave
Were would I be able to get my hands on some of that stuff.
An Autozone maybe?

....yep.

Thanks Alot

--------------


I agree with Dave.

Now where did I put that thermometer?????? <G>


Ed Cregger

Thanks, Ed....I can't believe someone actually agrees with me on something.

The red "high temp' silicon, and the blue, and some of the others are fine for intake
manifolds and such...but the Permatex 598B is made for manifolds that usually "did"
but no longer require a gasket....which shows how tuff the material really is. I was
suprised when I got these Sanderson aluminum headers for my hot rod, and the
directions specified that the headers be installed without a gasket, using only
the598B that they called for.

You can imagine how hot these headers get. [X(]

FBD.

You can try to use a flat glass ground and a fine sandcloth on it to offset that gap alittle more.

Maybe you are correct in this instance. Sorry the devil made me do it.

Bill

FBDAVE Your engine looks great - did you run out of black paint on the dampner pulley?

Dave I do have a better choice on RTV
IT is Permatex ULTRA GREY 599BR high temp. It will be invisable on the engine when you use it .

But I still agree with you..............

....speedster....you weren't supposed to see that.

I redeemed myself by doing a two-tone on the starter motor.

I haven't seen the grey high temp silicon, but that would be the hot set up.

FBD.

The grey RTV is the hot setup. Maybe this year I'll finish my 1955 HEMI powered bucket T with a chevy POWERGLIDE .

Hey guys, when i dropped by the LHS to get a new starter i grabbed some silicon sealant, It sure did the job. The sk 90 has really come to life with the tower 75 muffler. I am getting 9000 with the apc 16-4 and 5% nitro. That is almost 200 rpms more than i was getting with the pitts. And finally the engine feels tunable (no more backpressure and pump problems) there is a nice streak of smoke poring out the back wich will be a perfect setting for the first couple gallons. Never have i seen smoke come out of the exhaust of this engine, never! The engine never felt or ran like thise with the pitts muffler it once had on it.

Thanks for the help
Cameron

You can cut a gasket from a piece of thin aluminium ( the thin disposable heavy foil baking pans are perfect for this )and still use the sealer both sides martin-- it will squash down-- I have done this on my diesels and that stuff will seep
from the smalllest opening and make a mess

Cameron,

A little clarification would help me understand. Maybe I did not find the correct Tower muffler (LXVH43). Tower’s muffler appears to have a bolt spacing of 41mm and the ST bolt spacing is 47mm.

What did I miss? Thanks.

Bill

He was talking about a SK90 from Kangke.

Not a Super Tiger S90K

Hi bill, no it is not the ST s90k. The bolt spacing is still off should the muffler be mounted flush with the engine. But by using the exhaust extensions, the bolts were able to slide right through and tighten down no problem.