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Inline 4 Exhaust question

  • Thread starter Thread starter Hammered
  • Start date Start date
andrewpogany said:
ps As far as header / exhaust coating. Do not do yourself. Don't D*ck around and send it off to JetHot (or EQ). They have all the powder coat paint booths and ovens and will do it right. My Gs750 JetHot coated Yosh headers have lasted 20 years and counting. No rust. No problems. My Ford 460 truck headers got Jet Coating (silver as opposed to black on Suzi) 5 yrs ago as well....look perfect and brand new. Just an opinion from someone who has spent a buttload of money on various hotrod stuff (and a ton of my own time too) over the yrs and knows what's what and what's worth it....
Click to expand...
I'd have to disagree with you on the coating. It's no more difficult than painting your bike, which is 90% prep - same here. If you can do that, you can coat your exhaust. You just need an oven big enough and most are for bike exhausts.
 
The reason Im putting as much time into the exhaust design is I plan to ride the hell out of this thing. And ex rodder or not, gas aitn as cheap as it used to be. I live in SC but go home to Northern VA every chance I get and if I can squeze I few extra mile per gallon, then i say why not. Its not as if I plan to finish this build any time soon. As I progress, the concept evolves a little here and there. At one time, I had planned on cutting down the shocks to lower it, but since then, Ive designed a mount to run 2 3" dia air bags. Nothing about this bike will be stock when Im done (whenever that may end up being) So I figure why not step it up every place I can.
As far as Techlines coating,Ill be using Colorgard. Its an air dry coating that cures at about 200 and bakes on harder with the exhaust. A HVLP gun like suggested will do the job great.
 
Hammered said:
The reason Im putting as much time into the exhaust design is I plan to ride the hell out of this thing. And ex rodder or not, gas aitn as cheap as it used to be. I live in SC but go home to Northern VA every chance I get and if I can squeze I few extra mile per gallon, then i say why not. Its not as if I plan to finish this build any time soon. As I progress, the concept evolves a little here and there. At one time, I had planned on cutting down the shocks to lower it, but since then, Ive designed a mount to run 2 3" dia air bags. Nothing about this bike will be stock when Im done (whenever that may end up being) So I figure why not step it up every place I can.
As far as Techlines coating,Ill be using Colorgard. Its an air dry coating that cures at about 200 and bakes on harder with the exhaust. A HVLP gun like suggested will do the job great.
Click to expand...
How do you figure changing the exhaust will allow you to GAIN HP?? Everything done through the years for performance, or looks, has shown quite the opposite. Sure, you're dumping 40 lbs of weight, but in order to get the bike jetted right, you're expending more fuel. Seems quite contridictory to your idea..
 
TheCafeKid said:
How do you figure changing the exhaust will allow you to GAIN HP?? Everything done through the years for performance, or looks, has shown quite the opposite. Sure, you're dumping 40 lbs of weight, but in order to get the bike jetted right, you're expending more fuel. Seems quite contridictory to your idea..
Click to expand...
I never said I was increasing the HP by doing anything to the exhaust design. But if the design is good and I get a good coating with the Techline, I should see some gain in power. Plus with a change in the gearing, I should see a gain. And as you noted, the weight loss will add tot he MPG even if its a small amount.
 
Hammered said:
I never said I was increasing the HP by doing anything to the exhaust design. But if the design is good and I get a good coating with the Techline, I should see some gain in power. Plus with a change in the gearing, I should see a gain. And as you noted, the weight loss will add tot he MPG even if its a small amount.
Click to expand...
Well....Unless you manage to get the EXACT same amount of backpressure on that exhaust, I am betting it will flow differently (probably a little better) which will require an upjetting. Upjetting means more gas...Im just sayin..
 
lovin to see all these posts from you OH guys (being one myself...Cleve/Dayton/Columbus/Mansfield/Lancaster). warms the heart.:D

Now, to bidness...

Reddirtrider,
You said
I'd have to disagree with you on the coating. It's no more difficult than painting your bike, which is 90% prep
Really? I've been a painter (in a past life). How are you painting the INSIDE of that header? Just curious...maybe I'll learn something...

Also, I have to agree with CafeKid in that more power means more fuel (in general)....unless you have some ridiculously awesome plan for max power (and fuel) at full throttle and lean/miserly thing going on at part-throttle and most other driving conditions (Chebby Corvette has done it right/very well in this regard over the yrs).

Do tell...
 
My plan for attempting to squeeze all the MPH out of the build I can will come from a change in gearing. I dont need to launch like a bat out of hell on this. If I can drop the overall RPM, I should make up for any, if any jetting over the stock size. I am building an airbox type intake. Now as far as coating the inside of the header with Colorgard. Ive spoken with a REP and Im told that if need be, I could use a ball brush to coat the inside. Im not sure Ill need to coat the inside of the header. Colorgard really doenst need much in the way of prep other than for appearance sake so, a little time with a flap wheel, wire wheel and bastard file should give me all the exterior prep I need.
 
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