Bulletproof?

[azkiwi]

Just wondering what the term "bulletproof" means when talking about engines? I hear it used in conjunction with the type 4 bottom end and also read it recently in a post about the Toyota MR2 turbo engine.
Curiosity has the best of me now...or is that my ignorance...

Thanks

[S. Frankiewich]

It means extremely reliable. Typically the term is used in conjunction with a hot-rodded motor or an abused one. A bulletproof bottom end would indicate you could hot-rod the top end (higher compression, cams, turbo-charged, etc.) without having to worry about reliability on the bottom end. Or if an engine was generally bulletproof it could survive lack of oil changes, excessive lugging or over-revving without failing.

Being bulletproof doesn't mean, though, that nothing ever goes wrong so I wouldn't take it as gospel that something is "absolutely bulletproof."

Steve

[Mark Henry]

Ohhh come on guys!

It means the engine is covered in steel plating!

[JWest]

It means the engine is covered in steel plating

Gee, I thought kevlar was used to make something bulletproof!

[Zeke]

No, you guys are talking about my new billet clutch cable pulley. That's billetproof. Hah, ha. Prototype not quite finished, so don't ask. You will know when its available. Wayne has expressed interest.

[Mark Henry]

Originally posted by James Adams
Gee, I thought kevlar was used to make something bulletproof!

COME ON, get with the program!

Kevlar is the racing version! Stock was steel plate!

[azkiwi]

Originally posted by James Adams
Gee, I thought kevlar was used to make something bulletproof!

My understanding of how kevlar works is that if it gets shot in the "bottom end" it still will bruise....big time.

I think the steel plate is the safer option....

[handyher]

I thought bulletproof was when you reveved the engine to about 7000 rpm and dumped the clutch you still have feet hooked on to legs oh no wait that would be my mustang let's see in 914 that would be big whole in ground and back trunk gone huuummmmm

[Joe Ricard]

Depends on the bullet.... While in the Navy my Guns would shoot 70lb bullets that exploded. Not much was up to the task of being "my bullet proof" If you were within 14 miles, you could run only to die tired

[Jake Raby]

I build Kevlar shrouded Bulletproof engines weekly....LOL

[GWN7]

I know of a guy who builds engine killer bullets. Stainless steel rod inserted into the end of a .357 cartridge. The bullet pushes the rod thru the fender into the block. Sold to police departments only.

At 70lbs...don't they move up to the "shell" category?

A hunting broadhead will go thru Kevlar.

Anyone build arrowproof engines?