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Engline mounting angles
gsand - 19/11/03 at 03:39 AM

How much of an angle can be placed on a modern engine? the reason i ask is because i am trying to keep the rear bodywork as low as possible (mid engined car). I know that i can run my 4 stroke model aeroplane motor in any orientation, but how would this affect the sump and oil feed.

Regards, Glenn.

VinceGledhill - 19/11/03 at 08:48 AM

Could you not modify the sump and pickup?

Simon - 19/11/03 at 09:40 AM

Glenn,

As Vince says, main concern is going to be oil pickup, plus the fact the gravity will still be required to get oil to sump, so obviously you can't lie it flat.

Next consideration is fuelling. If you're using carbs, you'll need a different manifold to keep the float chamber reasonably level. If injection, you may get away with it.

HTH

ATB

Simon

[Edited on 19/11/03 by Simon]

David Jenkins - 19/11/03 at 11:33 AM

Just remember that every road car is designed to cope with fairly severe up and down gradients - so a few degrees one way or the other shouldn't make any difference!

David

gsand - 19/11/03 at 11:59 AM

quote:
Originally posted by Simon
Glenn,

As Vince says, main concern is going to be oil pickup, plus the fact the gravity will still be required to get oil to sump, so obviously you can't lie it flat.

Next consideration is fuelling. If you're using carbs, you'll need a different manifold to keep the float chamber reasonably level. If injection, you may get away with it.

HTH

ATB

Simon

[Edited on 19/11/03 by Simon]


Yeah, it should be too difficult to modify the pick p and the sump, and the motor will definately not be lying flat. I was thinking of 30-40 degrees of vertical, leaning to the front of the car. And I would be using fuel injection...

Although all this would not be necissary if i could find a motor with a low enough profile (height) so it can fit under my bodywork, which will be roughly the height of an XTR2 if not a little lower.

David Jenkins: Excellent point! Ya certainly got that right. But if i take up the allowable angle with the motor tilt, what is it going to do when i actually go up and down gradients

Regards, Glenn.

David Jenkins - 19/11/03 at 12:43 PM

quote:
Originally posted by gsand

...I was thinking of 30-40 degrees of vertical, leaning to the front of the car. And I would be using fuel injection...


Glenn,

I didn't realise that you meant so many degrees off horizontal!

The main problem you'll have is the oil in the sump. Apart from picking up the oil and pushing it through the oil-ways, the bottom of the cylinders get a lot of lubrication from the crankshaft splashing the oil around the bottom of the bores. Also, you would have to make sure that the lowest piston doesn't come up against the oil in the sump.

David

James - 19/11/03 at 01:03 PM

Glenn,

Have you thought about what engine you're going to use?

Some motorbike engines I've seen (admittedly installed in cars) are at quite an angle so maybe one of them would be an option?

HTH,

James

ned - 19/11/03 at 01:13 PM

A boxer engine/flat four as in a subaru/some alfa's/porsches would be low if they'd fit?!

Ned.

gsand - 20/11/03 at 01:41 AM

Yes that is a very good possibility, but then i need to go through the hassle of finding a suitable and cheap transaxle gearbox...