are they adjustable fore and aft? ive contacted Andrew at fasterjags but he wont give me a straight answer.

anyone know?

 

Straight answer no, not without modifcations. I have mine out at the moment and can post pics if that would help.

 

I didn't have to remove the mounts when I changed my engine, I just unbolted them from the block and made sure they weren't broken before putting the new motor in. But I don't recall seeing any adjustments on them. Sorry I can't be more help than that.

 

ok thanks guys. yes warren, i would appreciate some pictures. thank you.

also, the inner fender wells about 8 inches back from the subframe..... would these areas be able to support, oh i dont know, an engine thats 6inches shorter than a v12 and 2 inches skinnier? perhaps with a crossbrace of sorts?

 

M90

On the XJS the front subframe supports the engine and the bodywork. The car body rests on the subframe, so does the engine, nothing rests on the bodywork. So whether the bodywork lower front chassis rails would be suitable to support the engine, I rather doubt.

I have just gone and had a look at my spare front subframe. The constraint on moving the motor mounts back is the rack tower. You could cut and reweld the mounts back by about 2 inches max, before they are blocked by the tower. You also run out of subframe to weld the brackets to at this point, and in any case, even using the 2 inches available, would have to be carefull not to foul the rear subframe to body mounts. As far as a heart transplant goes, there are loads of 'lumpers' who have dropped in different engines, so someone could tell you if they move the engine back or not.

Alternatively, it might be possible, and easier, to move the mounting brackets forward on the block of the new engine. I can post a pic of the sunframe if needed.

Greg

 

since i know youre thinking about the 3800 swap, you better be making it a manual transmission buddy

 

i really, REALLY hate to admit it, but im giving up on the V12.
lol, you read me like an open book.

it WILL be manual.... eventually. im having trouble locating a manual that can handle the torque of a supercharged, long stroke, torque biased 3800. the Camaro guys have advised me to run far far away from the T5. T56 is my best option, but that would effectively double the project budget. Xp
for now itll either be a t700r, or a built t400. not sure if my built 400 will work as its BOP bellhouse pattern.

as far as the motor mounts are concerned, you guys have no idea how short the 3800 actually is. its probably not even 2/3's the length of the V12. luckily, i remembered that the L67 (front wheel drive supercharged) has this wonderful little timing cover mount for FWD applications, that i think will be just baaaarrreeelly long enough to reach the subframe.

 

I'll post some pics tonight for you.

This is going to be a challenge setting the mounts up you might need to mount the engine forward. A 350 chev XJS has almost 50/50 weight distribution so the L67 mounted way back may give you rear weight bias - NOT what you want

 

i was really hoping to get it back behind the front axles, so i could brag that ive got a mid engined, supercharged, Jaguar..... im hopeless, i know.
IMO farther back is better than farther forward. but as you said, being too far back could possibly throw a wrench in the works and lead to a screwy handling car.

since the m90 is mounted backwards, ill need an elbow for the Throttle body, which will take up some firewall space. because of this, it has to come forward farther than the V12, but it still wont be long enough for conventional style RWD motor mounts. hopefully the FWD front mount will give me some breathing room. if im lucky, i can find an equallibrium between these two issues and be able to use the SBC driveshaft. Thankfully, Johns cars will make me a custom length driveshaft for $295.

 

You could use the M90 elbow from an Aussie Commodore this is an L67 mounted longitudinally with the TB mounted on the end of elbow.

Here is a pic off eBay http://www.ebay.com.au/itm/supercharged-v6-commorore-VX-VY-L67-motor-engine-/330734605872?pt=AU_Car_Parts_Accessories&hash=item 4d01519630

 

The distance between the bellhouse and the front mounted FWD motor mount is 17 inches. crude measurements put this at about the same area that the V12 downpipes. does anyone know the distance between the V12 bellhouse and the V12 motor mounts?

i actually got the idea from pictures you sent me back in october of your Commodore. couldnt remember where i saw it though. thanks for reminding me.

its too bad about the price because those Holden L67's are ideal. you can pick up an american L67 for less than $400 bucks,

 

DARN,, i thought we were gonna get a(as OP said) twin turbo V12!!!!!

 

Well does V6+V6 count?

 

i dont see you jumping in with your wisdom as to what the problem could be.

besides, you only need one turbo on a 3800 to achieve 500+ horsepower.

 

Lets have a moment of silence as another V12 fades into the mist...

 

make me feel bad about it why dont you. you cant say i didnt try to save it. 2 & 1/2 months of getting nowhere is enough.

ive always wanted a V12 table.


EDIT: way to kill my buzz. i genuinely feel like **** about it now.

 

I thought you were making progress on it!

 

the only thing i ever succeded in doing was making it run worse than when i bought it.

 

Well, I won't tell you what to do, or not do with your own car of course..lol...but let me put things in the perspective I had when I couldn't get mine to work.

It's an engine. Just like all internal combustion engines, just with more cylinders than most. If you know the mechanicals are all in order, then that just leaves the electrical end to deal with. Except for slight differences, the electronics are no different than any other fuel injected motor. You have fuel, spark and the timing. Once you have those in order, it runs!

 

I wish I lived closer, I'd pop over and help.