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#21439 - 01/13/06 02:33 PM Engine offset in stock chassis?
jyrki Offline
master

Registered: 01/21/03
Posts: 2893
Loc: Finalnd, Perkele
I know the pinion is offset 1 3/16", but is the crank centerline offset the same amount? This may sound stupid, but I'm building a car that had no tranny or engine, so I have no idea.
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#21440 - 01/13/06 02:54 PM Post deleted by Defbob [Re: jyrki]
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#21441 - 01/13/06 03:12 PM Re: Engine offset in stock chassis?
jyrki Offline
master

Registered: 01/21/03
Posts: 2893
Loc: Finalnd, Perkele
Thanks Fred! Rethinking the situation, since the pinion shaft is straight from rear to front, the engine and trans must be in the same line. I somehow thought that the engine / trans might be pointed even more to the right than the pinion offset. So, it's the same 1 3/16" then. After it's there, I've got a better idea of where the turbos are going to be.... How is the RR progressing?
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#21442 - 01/13/06 03:33 PM Re: Engine offset in stock chassis? [Re: jyrki]
QWK_ENUF Offline
top fuel

Registered: 09/20/05
Posts: 2442
Loc: LOWELL IN
i thought the factory offset was 1 1/16
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#21443 - 01/13/06 04:40 PM Re: Engine offset in stock chassis? [Re: jyrki]
HardcoreB Offline
master

Registered: 01/20/03
Posts: 2638
Loc: Shelby Twp. Mi
Without sounding redundant because Fred made some good suggestions already...The driveline tunnel centerline is set up for the factory 1 3/16" offset. Verify the position of the pinion yoke and align the eng./trans. from there. If for any number of reasons the rear isn't at that position and you slam (lower) the car and/or run a large diameter driveshaft (3.5+inch) you will experience interference with the tunnel. With the big power you are sure to be making (It's in your nature.) spend the extra time properly aligning the driveline accurately.

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#21444 - 01/13/06 05:05 PM Re: Engine offset in stock chassis? [Re: HardcoreB]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 51003
Loc: Romeo MI
If your building a car, I would keep the engine on
centerline and cut the rearend to put the pinion
on center, the reason for it being offset is for
U-joint life and for the drivers area(foot room)
If it was all on center the U-joint wouldnt move
and grease itself. You would be putting in pinion
angle(pointed slightly downward in relation to the
drive shaft)
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#21445 - 01/14/06 06:55 AM Re: Engine offset in stock chassis? [Re: MR_P_BODY]
HardcoreB Offline
master

Registered: 01/20/03
Posts: 2638
Loc: Shelby Twp. Mi
Wrong. Do not reengineer already correct pinion placement. The misalignment that lubricates the u-joints is inherent to the engine and rearend being on different planes with one another. The pinion angle engineered into the set-up will induce u-joint rotation at both ends as well.

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#21446 - 01/14/06 05:38 PM Re: Engine offset in stock chassis? [Re: HardcoreB]
jyrki Offline
master

Registered: 01/21/03
Posts: 2893
Loc: Finalnd, Perkele
According to direct connection chassis book, the body tolearances at the factory were pretty big. I'm only back halfing this car, slo the stock engine offsrt will remain. And actually we got the tranny and engine mounts done today. Of course we try to do things as well as we can, schedule permitting, but this is not a too serious project. In the end (of 2006), if we have a C-body capable of 8 second ET's in street trim, I'm very happy, even proud. This thing is going to weigh 4000 lbs easy.
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#21447 - 01/14/06 08:20 PM Re: Engine offset in stock chassis? [Re: HardcoreB]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 51003
Loc: Romeo MI
Quote:

Wrong. Do not reengineer already correct pinion placement. The misalignment that lubricates the u-joints is inherent to the engine and rearend being on different planes with one another. The pinion angle engineered into the set-up will induce u-joint rotation at both ends as well.




Well Sean I disagree, when I built mine I moved
it on centerline as well as the rear. The reason
you speak of is for a production type of driver
that doesnt get on it so it has to have off set to
stay lubed not nessasrally for the best power. You
want it in line under max power for the best results
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W-9 8.94 @ 151 NOW ON E-85
Mike "Raff"...(180)Watching over us
CAR IS FOR SALE

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#21448 - 01/15/06 08:26 AM Re: Engine offset in stock chassis? [Re: MR_P_BODY]
HardcoreB Offline
master

Registered: 01/20/03
Posts: 2638
Loc: Shelby Twp. Mi
Quote:


Well Sean I disagree, when I built mine I moved
it on centerline as well as the rear.




So they are now back in alignment. LOL
Quote:


The reason you speak of is for a production type of driver
that doesnt get on it so it has to have off set to
stay lubed not nessasrally for the best power.




YOU were the one that suggested he center the pinion, creating a misalignment, so the u-joint will lubricate.

Quote:

You want it in line under max power for the best
results.



That's what I've been sayin' all along, clear as day. I wasn't gonna keep Because your 2nd reply contradicts your 1st one. I just want it to be clear to jyrki (spelling?) how to align the drivetrain. AND do it such that it wont collide with the d/s tunnel, trans. mount and tunnel, steering box, and master cylinder to name a few. Which it would if he centered it in the car.

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#21449 - 01/15/06 08:41 AM Re: Engine offset in stock chassis? [Re: HardcoreB]
MR_P_BODY Offline
Master

Registered: 06/13/03
Posts: 51003
Loc: Romeo MI
Sean, I guess I must have mis-read your post
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