Go Back   VetteMOD.com > VetteMOD Technical Discussion > Drive Train

Reply
 
Thread Tools
  #1  
Old 09-15-2018, 07:31 PM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,584
My Photos: (0)
Default Moving engine slightly rightward?

While looking at "other" things under the hood, it struck me that it might be possible fit-wise to move the engine/trans another half inch towards the right. This would obviously require some tweaks to the exhaust routing, and a couple of frame clearance cuts for the right side headers and fuel pump removal clearance (along with modifying the motor mount horns), but that's not that tough of a job. My main question, until I crawl under the car and stare at the driveshaft, is if there's any obvious driveshaft angle issues that I'm not considering.

Thanks for any input.
Reply With Quote
  #2  
Old 09-16-2018, 12:45 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,331
My Photos: (260)
Default

Don't think there would be any driveline angle problems. Maybe some clearance issues with the transmission tunnel?

When you do crawl under there, can you do me a favor? I would like to know the driveshaft (horizontal) angle compared to the side rails of the chassis.
__________________
Reply With Quote
  #3  
Old 09-16-2018, 06:45 PM
mrvette's Avatar
mrvette mrvette is offline
United States | Phantom of the Opera
 
Join Date: Mar 2008
Location: NE Florida
Posts: 15,295
My Photos: (3)
Default

Long as yawl under there, I would like to know the height from drive yoke output sleeve at bottom, to bottom of the cross support...

like this 0

the in between distance on mine is 5"
to this _

at 80 mph at ~2400 rpm with 336 rear and .70 overdrive 200 r4 auto the shifter is mounted to the cross support....I feel a LOT of vibration in the handle....not a GROSS amount, but alot more than I would imagine....so I thinking of driveshaft angles on the vertical plane.....

ALSO, on that cross support, is the center section where the trans sets a different height than the two section outside of the exhaust loops?? reason is that I modified hell outta my cross support and I wonder if I screwed it up.....

__________________
"Hell, there are no rules here ... we're trying to accomplish something." Thomas Edison
I have a little list, let ALL of them be MIST......
Reply With Quote
  #4  
Old 09-19-2018, 12:10 AM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,584
My Photos: (0)
Default

Quote:
Originally Posted by BBShark View Post
Don't think there would be any driveline angle problems. Maybe some clearance issues with the transmission tunnel?

When you do crawl under there, can you do me a favor? I would like to know the driveshaft (horizontal) angle compared to the side rails of the chassis.
I can probably do that, if I understand you correctly. Are you basically just interested in seeing if the driveshaft is not parallel to the frame rails?
Reply With Quote
  #5  
Old 09-19-2018, 01:31 AM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,584
My Photos: (0)
Default

Quote:
Originally Posted by mrvette View Post
Long as yawl under there, I would like to know the height from drive yoke output sleeve at bottom, to bottom of the cross support...

like this 0

the in between distance on mine is 5"
to this _

at 80 mph at ~2400 rpm with 336 rear and .70 overdrive 200 r4 auto the shifter is mounted to the cross support....I feel a LOT of vibration in the handle....not a GROSS amount, but alot more than I would imagine....so I thinking of driveshaft angles on the vertical plane.....

ALSO, on that cross support, is the center section where the trans sets a different height than the two section outside of the exhaust loops?? reason is that I modified hell outta my cross support and I wonder if I screwed it up.....

I've got a home made aluminum crossmember for the transmission on the car, so I can't give you any useful height information there, Gene. Sorry.

Regarding the trans support center section, I looked at the old original support and it looks to be 1.5-2 inches lower than the top surfaces of the outside sections.
Reply With Quote
  #6  
Old 09-19-2018, 10:55 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,331
My Photos: (260)
Default

Quote:
Originally Posted by 69427 View Post
Quote:
Originally Posted by BBShark View Post
Don't think there would be any driveline angle problems. Maybe some clearance issues with the transmission tunnel?

When you do crawl under there, can you do me a favor? I would like to know the driveshaft (horizontal) angle compared to the side rails of the chassis.
I can probably do that, if I understand you correctly. Are you basically just interested in seeing if the driveshaft is not parallel to the frame rails?
My guess is that factory cars have the driveshaft level to the outside frame rails. I put a level on a friends cars that is all original and that's what I found. I also saw a restored rolling chassis over the weekend and an eyeball measurement looks like the driveshaft was in the same plane as the frame rail.

When I was measuring mine, I found that the differential is horizontal and the engine is down 3.5 degrees at the transmission. If I were to assemble as is, the angle between the driveshaft and the differential would basically be 0 degrees.

What I did was move the nose of the differential down to it's limit (about 1 degree). So that means moving the transmission output up until I get eqal angles. That means raising the transmission drastically and at this point I think I'm going to be cutting the tunnel out and moving it up.

I really want to avoid that and am puzzled that factory cars have no angle at the differential. I also have a Tremec transmission which makes things more difficult (because of its size).
Reply With Quote
  #7  
Old 09-19-2018, 11:57 PM
rtj's Avatar
rtj rtj is offline
United States | Addict
 
Join Date: Nov 2011
Posts: 1,521
My Photos: (45)
Default

Quote:
Originally Posted by BBShark View Post

I really want to avoid that and am puzzled that factory cars have no angle at the differential. I also have a Tremec transmission which makes things more difficult (because of its size).

I’m going from memory, undergraduate was a long time ago, but....

For u joints the same plane horz and vert would be optimum, no torque variations. To keep torque variations low, the axis of rotation should be parallel.

[Only registered and activated users can see links. Click Here To Register...]

This guy says direct in line is bad, but he wants some joint rotation. I assume for needle bearings. Otherwise I agree with his drawing.

Last edited by rtj; 09-20-2018 at 12:05 AM..
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 04:33 AM.
 


Design by: vBulletin Skins Zone
Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.