alainmengoli@hotmail.com
|
| posted on 11/1/04 at 05:31 PM |
|
|
Engine stressed!!!??
Is it better to use the engine as a stressed member reinforcing the chassis or keep it on engine rubber mounts?
|
|
|
|
|
Alan B
|
| posted on 11/1/04 at 06:39 PM |
|
|
Rubber mounts.
Most engine blocks are not designed to be stressed members. I have a buggy with solid trans/engine mounts, but there are no other loads fed into the
block..i.e. the engine is not part of the stucture
|
|
|
I love speed :-P
|
| posted on 11/1/04 at 06:49 PM |
|
|
I think the new Ferrari f1 engine is solidly fastened to the rear suspension
Don't Steal
The Government doesn’t like the competition
|
|
|
Alan B
|
| posted on 11/1/04 at 06:57 PM |
|
|
Most F1 engine/gearboxes are stressed...suspension hung right on the gearboxes in most cases......but they are designed to take the loads..
|
|
|
MikeR
|
| posted on 11/1/04 at 07:34 PM |
|
|
I've been wondering this for a while. In the locost what do people think the effect of tying the bottom and top chassis rails to the engine
mounting point (plus tirangulating fore and aft) really would be?
The crossflow block seems to be a faily substancial lump of cast iron. If we where talking about the K-series I could understand the concern.
|
|
|
Alan B
|
| posted on 11/1/04 at 08:13 PM |
|
|
Mike I agree the block is quite substantial...but the consequences of just say a couple of thou' of cylinder distortion means a siezed
engine...that, I think is the usual concern....
But, hey if someone wants to try it...
|
|
|
alainmengoli@hotmail.com
|
| posted on 11/1/04 at 09:59 PM |
|
|
My concern was mostly vibration.
|
|
|
Alan B
|
| posted on 11/1/04 at 10:22 PM |
|
|
Oh yeah you'll get vibration..I do in my buggy....but it's not too bad
|
|
|
tadltd
|
| posted on 12/1/04 at 10:38 AM |
|
|
don't most modern sports bikes use the engines as stressed members?
Steve.
|
|
|
Alan B
|
| posted on 12/1/04 at 02:15 PM |
|
|
Good question Steve...not one I can answer though...
I'll bet if they are though that I was designed that way.
|
|
|
Spyderman
|
| posted on 12/1/04 at 02:50 PM |
|
|
Bike engines are usually stressed members. However they are never likely to see the same sort of loads or deflections loaded into them in a bike frame
as they would in a car chassis.
Any possible gains of using the engine as a stressed member would soon be negated by the vibration fed into things like the instruments. A big problem
with bikes is vibration and trying to read the clocks. Well it was in my day!
Vibration play havoc with things like bulbs!
By mounting engines onto rubber you are also damping out some of the torque loads when changing gear or dropping the clutch.
Terry
Spyderman
|
|
|
violentblue
|
| posted on 12/1/04 at 03:00 PM |
|
|
I cant see any reason one couldn't use solid mounts and use the engine block as a structural member, as long as it wasn't directly taking
the load. if you were using it for additional chassis stiffening it should be fine, eliminating flex can only be a good thing might as well use what
you have rather than adding additional weight.
a few pics of my other projects
|
|
|
ned
|
| posted on 12/1/04 at 03:11 PM |
|
|
If anyone is interested as an example the (mid engined) race car I mechanic on uses the vx xe as a stressed member and hangs suspension of the gearbox
casing.
Ned.
beware, I've got yellow skin
|
|
|
JoelP
|
| posted on 12/1/04 at 03:19 PM |
|
|
mmmm...
that looks nice...
|
|
|
kb58
|
| posted on 12/1/04 at 03:50 PM |
|
|
My opinion is that it's a bad idea unless the drivetrain was designed for it. Were the engines we use designed for this stress? No. Do we, as
amateur builders really know what stress levels it'll see? No. Do we know the long-term effects of running the drivetrain that way? No.
Too many unknowns for me.
|
|
|
Hugh Paterson
|
| posted on 12/1/04 at 11:11 PM |
|
|
Ned for christ sake stop posting pics of that thing, the drool an slebber is clogging up my keyboard now ughhhhh
Shug.
Next time ur going to croft with it let me know
|
|
|
ned
|
| posted on 13/1/04 at 12:05 PM |
|
|
Hugh,
We're at croft 15th/16th May according to my provisional calendar Hope the bodywork aerdynamic mods are finished for the start of the season
in april.
see you then?
Ned.
beware, I've got yellow skin
|
|
|
