LS4 / F40 swap - fieroguru (Page 19/216)
dobey MAR 28, 04:58 PM
That is one nice looking flywheel.
Bloozberry MAR 28, 06:25 PM
VERY nice! But I can't help thinking you're hiding a blooper under that paperwork there guru Next stop balancing?
fieroguru MAR 29, 01:33 AM
Here is a pic after I installed the alignment pins:


Ordered the ring gear, but can't do much else flywheel related until it shows up, so decided to be a little destructive while watching some TV:
Stock LS4 harness:


After a couple of shows:


I will not be needing the TCM or the transmission connector, so I didn't take the time to take them apart... just cut them.

[This message has been edited by fieroguru (edited 03-29-2011).]

fieroguru MAR 29, 05:02 PM
Made some progress on the rear exhaust...



There will be two ring clamps that connect the exhaust to the manifolds. Here is the one in front:


And the one in the rear will go here:
fieroguru MAR 29, 09:11 PM
Got the fuel injector portion of the harness done. I will wire tie it up close to the fuel rail when it is installed to keep it tucked mostly out of sight.
av8fiero MAR 29, 11:17 PM
Awesome work. I'm envious of your machinist skills. I do have a question on your exhaust system. From your pics it seems that the rear exhaust manifold will be solidly fastened to the remainder of the exhaust system with only the front exhaust manifold and it's downpipe isolated from the remainder of the system with a flex joint. Are you planning on another flexjoint immediately after the merge? If not are you concerned about any vibration/buzzing and/or any stress cracking over time?


Good luck with your build and may your project go as smoothly as your work is elegant
fieroguru MAR 30, 06:36 AM
Thanks for the compliment!

The rear manifold will be solid to the muffler back section. There will be two supporting arms that will come off the rear engine/transmission mounts to support the tail end of the exhaust and allow the exhaust to move with the engine/transmission vs. being mounted to the stationary cradle.
av8fiero MAR 30, 08:17 AM
Ok. I'm wondering then why you used the flex for the front manifold/downpipe. If the whole exhaust system is going to float with the engine is the flex even necessary?
1fatcat MAR 30, 08:39 AM
Lookin' good! Any idea what that flywheel weighs?

I'm a little confused on the issue of the flex section too. If you'r running the exhaust to move with the engine flex, are you concerned about what the tail pipe tips will be doing when you rug it? A half inch movement at the engine may translate to an inch or three at the tips.

[This message has been edited by 1fatcat (edited 03-30-2011).]

fieroguru MAR 30, 09:26 AM

quote
Originally posted by 1fatcat:

Lookin' good! Any idea what that flywheel weighs?

I'm a little confused on the issue of the flex section too. If you'r running the exhaust to move with the engine flex, are you concerned about what the tail pipe tips will be doing when you rug it? A half inch movement at the engine may translate to an inch or three at the tips.




Without the ring gear the flywheel is just under 10 lbs. So once the ring gear is added, it should be between 11 and 12 lbs.

While the engine is rubber isolated, the mounts are quite stiff (front A-arm suspension bushings from a mid 70's camaro) and spaced quite a bit apart, so I am not expecting much defelction, maybe +/- 1" of movement at the tips. Under acceleration the tips will lower and while engine braking the tips will raise. There will be atleast 2" of clearance between the tips and the fascia.