MORE random pics......

[McLovin]

Originally Posted by URY914

Damn, sorry to see Valerie has put the weight back on.

Truly random:

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]

[RoadRaceJosh]

Originally Posted by svandamme

Well i explained in my post that vacuum leak can cause lean running 4 stroke engines , and when a high comp 4 stroke engine runs lean, it can cause among other things, detonation.

An intake tract leak on a 4-stroke will cause lean running, but a bottom end vacuum leak? That's 2-stroke territory because there is little to no vacuum in most all 4-stroke crankcases as most 4-strokes have the crankcase open to the atmosphere through the breather. Most 4-strokes use a PCV valve to prevent an excess of air flowing into the intake tract. I keep saying most because there are exceptions. Like the road draft tube on my old Studebaker.

Originally Posted by svandamme

Again, nobody said anything about 2 strokers, and the comment about vacuum in the bottom end did not automatically imply 2 strokes either because the crank breather ties into the vacuum system of most 4 stroke FI engines.

The crankcase breather is almost always open to the atmosphere through the air box. Crankcase vapors in excess of what the PCV valve can handle flow through the breather and into the intake upstream of the throttle. There is no vacuum upstream of the throttle aside from any filter and ducting restrictions.

[URY914]

[sammyg2]

Originally Posted by RoadRaceJosh

An intake tract leak on a 4-stroke will cause lean running, but a bottom end vacuum leak? That's 2-stroke territory because there is little to no vacuum in most all 4-stroke crankcases as most 4-strokes have the crankcase open to the atmosphere through the breather. Most 4-strokes use a PCV valve to prevent an excess of air flowing into the intake tract. I keep saying most because there are exceptions. Like the road draft tube on my old Studebaker.



The crankcase breather is almost always open to the atmosphere through the air box. Crankcase vapors in excess of what the PCV valve can handle flow through the breather and into the intake upstream of the throttle. There is no vacuum upstream of the throttle aside from any filter and ducting restrictions.

Correct-a-mundo, when I first saw it I thought it was a two stroke engine, sea-do or yamahamer or such.
I didn't look close enough to see the indentations in the piston for the valves to id it as a 4 stroker.

In my OP I was referring to the bottom end leak of death on a two stroke.
A regular two stroke engine has to be sealed on the bottom end to withstand at least a 2 psig pressure test, otherwise it can suck in air on every intake stroke and lean out and sieze up.

[sammyg2]

2 stroke yammer:

[URY914]

[Oh Haha]

Originally Posted by URY914

that is too cool!!

If I were lame enough to actually put silly figures on my car I would use that one.

[Racerbvd]

[porsche930dude]

i hate the stic figure stickers! but i like this one

[SoCal911T]

This is the sticker on my beater.

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]

[GH85Carrera]