Author Topic: esr silencer turn down (Read 4813 times)

dem3500 · « **on:** June 23, 2015, 03:18:29 PM »

has anyone found a turn down for an esr silencer? i want to quiet my exhaust a little bit. ive found reference to a duncan down spout fitting with little modification but i cant find where to buy one.

KASEY · « **Reply #1 on:** June 23, 2015, 09:36:34 PM »

sent you a message on facebook. easier to do pictures

dem3500 · « **Reply #2 on:** June 23, 2015, 10:22:20 PM »

Ha! That's perfect! Did you find the stainless piece at the parts store?

Jerry Hall · « **Reply #3 on:** June 24, 2015, 12:54:28 AM »

Quote from: dem3500;55404

has anyone found a turn down for an esr silencer? i want to quiet my exhaust a little bit. ive found reference to a duncan down spout fitting with little modification but i cant find where to buy one.

A bend anywhere in the stinger increases flow resistance even if it is a constant diameter mandrel bend. A turndown will add another 45 to 90 degrees of bend to the stinger / silencer flow path and always increases back pressure. If you are running a stinger that has an ID of 26.0 mm or less on an engine package that is making much over 50 hp, you may already have to much back pressure.

The big question is: Does your pipe need more restriction for the power level of your engine?

If you do not know it may cost you a piston and bore job to find out.

dem3500 · « **Reply #4 on:** June 24, 2015, 07:49:22 AM »

Quote from: Jerry Hall;55415

A bend anywhere in the stinger increases flow resistance even if it is a constant diameter mandrel bend. A turndown will add another 45 to 90 degrees of bend to the stinger / silencer flow path and always increases back pressure. If you are running a stinger that has an ID of 26.0 mm or less on an engine package that is making much over 50 hp, you may already have to much back pressure.

The big question is: Does your pipe need more restriction for the power level of your engine?

If you do not know it may cost you a piston and bore job to find out.

ok i dont know squat about flow restriction. i have a 350 with a 4mm crank trx5b and a standard esr silencer

KASEY · « **Reply #5 on:** June 24, 2015, 09:49:17 AM »

Pretty sure there won't be enough restriction in this to hurt anything,, its a sound director, not a elbow its 1.75 id

etccb · « **Reply #6 on:** June 24, 2015, 10:45:24 AM »

That type of deflector being that much larger then the stinger and core should not add heat. The trx5b also runs 10ish deg cooler on 350ish cc builds then the trx5 even without a cr500 size stinger.

dem3500 · « **Reply #7 on:** June 24, 2015, 10:54:50 AM »

off the topic question but whats the difference between the 5 and 5b?

Jerry Hall · « **Reply #8 on:** June 24, 2015, 11:23:34 AM »

Quote from: dem3500;55429

off the topic question but whats the difference between the 5 and 5b?

The head pipe (the section of pipe from the exhaust port to the 1st slip joint) has a larger inside diameter at the exhaust flange.

dem3500 · « **Reply #9 on:** June 24, 2015, 11:59:09 AM »

Quote from: Jerry Hall;55432

The head pipe (the section of pipe from the exhaust port to the 1st slip joint) has a larger inside diameter at the exhaust flange.

gotcha! thanks

dem3500 · « **Reply #10 on:** June 24, 2015, 12:06:08 PM »

[MENTION=145]KASEY[/MENTION] where did you find that piece of stainless pipe?

KASEY · « **Reply #11 on:** June 24, 2015, 08:16:45 PM »

I have some remnants out back I will see if I have another bend,,,