View Poll Results: To polish ther J-tube or not
Voters: 11. You may not vote on this poll
J-Tube finally here
Apr 13, 2006 | 07:45 AM
#21
Hey guys, I should have taken pictures inside my J-tube. I used a honer (the 3 stone thing on the end of a drill) and got the J-tube perfectly smooth up until the bend. I then used the "mothers power ball" with Al polish and made it shine. It was a half assed job since I did not remove the tube, rather just did it on the truck but it lookded great!
I vote for polishing as well.
I vote for polishing as well.
Apr 13, 2006 | 09:12 AM
#22
Thread Starter
TECH Addict
Joined: Jul 2005
Posts: 2,060
Likes: 0
From: Stockton, CA
Originally Posted by Keith
I say think about it like this:
Look at any LSx intake manifold. It's pretty smooth right? Well, it is a dry flow manifold, meaning only air is passing through. What about your J-tube? Pretty sure that is only passing air, unless you are putting some meth through it.
A rough tube will promote mixing of air and fuel due to some turbulence at the boundry layer. Take a look at all those old carb'd intakes.
My vote is for polishing.
Look at any LSx intake manifold. It's pretty smooth right? Well, it is a dry flow manifold, meaning only air is passing through. What about your J-tube? Pretty sure that is only passing air, unless you are putting some meth through it.
A rough tube will promote mixing of air and fuel due to some turbulence at the boundry layer. Take a look at all those old carb'd intakes.
My vote is for polishing.
Thanks for your input
Mark
Apr 13, 2006 | 09:50 AM
#23
Originally Posted by 2004Denali
Thanks Brian, May I ask why you don't recommend polishing the J-tube. I can't see where it would do any harm but I don't know. If I am going to have it polished I will have it done in the next couple of days because I want to get the J-tube back on Friday. Brian will it cause any damage or driveability issues. I value your opinion but just hope you would expand on it.
Again thanks for looking into the Torque specs
Mark
Again thanks for looking into the Torque specs
Mark
will not cause any issues at all. As long as you are not spending big money on it then you are fine. This is not the same as the old days with intake manifolds and polishing the intakes......There is no fuel mixture in the J-Tube.
Granted there MIGHT, and I mean MIGHT be a gain, it will not be SOTP....infact the gain will be negligible at best.
Apr 13, 2006 | 09:59 AM
#24
Thread Starter
TECH Addict
Joined: Jul 2005
Posts: 2,060
Likes: 0
From: Stockton, CA
Thank you Brian for expanding on your Thoughts. Since you said "there is no fuel mixture in the J-tube" would your opinion change if I was running Meth through the J-tube?
Thanks for always being there for our questions
Mark
Thanks for always being there for our questions
Mark
Apr 13, 2006 | 11:26 AM
#25
Originally Posted by 2004Denali
Thank you Brian for expanding on your Thoughts. Since you said "there is no fuel mixture in the J-tube" would your opinion change if I was running Meth through the J-tube?
Thanks for always being there for our questions
Mark
Thanks for always being there for our questions
Mark
Would not change my opinion at all.
Anytime
Apr 13, 2006 | 11:34 AM
#26
I think you whould be better off putting straightening vanes in J-tube to help the flow. I've seen flow increase as much as 40% in tight 90* bends with the addition of straightening vanes. Granted it was a different scenario, but all the laws and rules still apply.
Apr 13, 2006 | 11:58 AM
#27
Originally Posted by BlownChevy
it will not be SOTP....
To some people eaking out every last bit of flow advantage is worth the effort. Anything you do to reduce friction on the pre blower side will increase VE and ultimetly performance, (think 90mm TB vs 78mm TB).
Apr 13, 2006 | 12:12 PM
#29
My basic opinion on this is kinda like balancing your camshaft (~3hp gain right). If you are going to get crazy with time and money on something that gives you VERY little gains then you should spend the money to do ALL the little things. Those little things are what set the average joes apart from the high rollers. Needle roller cam bearings, Titanium valves and retainers, custom lightened pistons, crank and rods, should be done as well. If you can afford 20 more hp for $10k then you shouldn't leave anything on the table. 
Apr 13, 2006 | 12:19 PM
#30
Originally Posted by moregrip
This I do agree with, IMO you will not feel whatever gain is achieved by polishing the inside of the J-Tube. That's why I suggested a before and after test to 2004Denali to see if we could quantify results.
To some people eaking out every last bit of flow advantage is worth the effort. Anything you do to reduce friction on the pre blower side will increase VE and ultimetly performance, (think 90mm TB vs 78mm TB).
To some people eaking out every last bit of flow advantage is worth the effort. Anything you do to reduce friction on the pre blower side will increase VE and ultimetly performance, (think 90mm TB vs 78mm TB).
and if this were the Pro Stock class of NHRA I would aggree.
Last edited by BlownChevy; Apr 13, 2006 at 08:36 PM.