what makes a engine "bomb" vs a "tank" motor?

[cybermob2]

first off this is not a rumor starter or a "hearsay" thread. please keep it as factual as you can.

i'm just curious though... with all the hipo motors being built, some at builders, some at home, where is the reliability and/or unreliability coming from?

without naming names (riders OR builders), some people have had seemingly good luck with certain builders and seemingly bad luck with other builders.

i'm just wondering what is making all these motors blow up or run for multiple seasons under heavy abuse? deto? are we talking component quality? tuning? hand finishing errors? machining errors? assembly errors?

i mean seriously... a stock motor can basically only go together with new components one way, i'm not sure how you can screw it up other than putting ill-fitting/inferior (poor tolerances, faulty machining) parts.

with the possibility of doing up a project boat with a more hopped up motor than my stock limited, i'm curious going forward...

again, no names need to be mentioned good or bad...

 

[Boris]

The devil is in the details.

What may be insignificant to some is a huge deal to others.

Our motors can take a whole bunch of abuse but sometimes the littlest thing can make them go BOOM.

 

[Superjet3]

When sleeves are replaced incorrectly they can drop once the motor heats up and that causes alot of problems. Bad tuning and tired parts will also kill a motor.

 

[Big Kahuna]

When sleeves are replaced incorrectly they can drop once the motor heats up and that causes alot of problems. Bad tuning and tired parts will also kill a motor.

Yeah, that can happen....... happened to a friend, except his sleeves dropped about 7-8 years after they were installed, some guy from Florida did the port job and sleeve install.

other things can actually have nothing to do with the person who did the engine mods, it can be the person putting the motor together and forget something, install a circlip incorrectly, forget an oring who knows.....

and sometimes things just happen for no reason, bearing races/cages fail, wrist pins, rings break, carbs run lean.

 

[Scorn800]

You can cause deto by overloading the motor with too tall of prop or pump load(ie: tbm cone or mag pump)

 

[freestylegeek]

Let's not forget water ingestion. A good hood seal, good aftermarket hood, and stock flame arrestors go a long way. Also, the top screw on the 'b' pipe can allow water into the cylinders during the return wave on some set-ups. Ultra tight squish, high compression, and stroker cranks don't care much for water.

 

[ANT]

You can cause deto by overloading the motor with too tall of prop or pump load(ie: tbm cone or mag pump)

some thing like that happen to you b4? just a wild guess haha


The motor can blow if the porting is done wrong too. THere are somany reasons a motor can blow, but as far as an internally modified engine, what will make it blow is if something is clearanced wrong, squish isnt right, anything that has to do with the builder and thats why theres few people that modify motors is because few people know how to do everything perfect or the right way.

 

[SUPERTUNE]

Don't forget about you guys trying new tricks and sinking them, then bending the rods when you try and pump out the water in the engine!

 

[salimov]

2 SUPERTUNE
can I get beside you consultation on engine?

 

[Big Kahuna]

Here is something else that gets me, you get a motor built by a builder, does not matter who did it. This is a built motor. The only expectation of it is that it should run for the first 5 minutes, after that, expecially if you tuned it, installed, etc..... the rest is on your shoulders....... unless there is just a mistake or blatent error then there really should be no expectation of a warranty of any means. Especially after you have run it for 6 months or so.

 

[Rickster]

Here is something else that gets me, you get a motor built by a builder, does not matter who did it. This is a built motor. The only expectation of it is that it should run for the first 5 minutes, after that, expecially if you tuned it, installed, etc..... the rest is on your shoulders....... unless there is just a mistake or blatent error then there really should be no expectation of a warranty of any means. Especially after you have run it for 6 months or so.

EXACTLY!!!

If someone wants reliability, then they need to go back to stock! Every modification we do to our engines shortens the life expectency of them.

You want to play, you got to pay!

:stooges:

 

[Big Kahuna]

EXACTLY!!!

If someone wants reliability, then they need to go back to stock! Every modification we do to our engines shortens the life expectency of them.

You want to play, you got to pay!

:stooges:

Tyson: Whaaa Whaaa, my new 15mm stroker motor seized up, I only ran it WOT for about 10 minutes, that sorry as engine builder from Boobies Motorsports aint worth a chit...........

Chunk: Hey, how much tuning did you do"

Tyson: oh, some guys on the boards told me to go 1.5 turns on low and closed on the highs. man those plugs were clean, great advice, I did not want to have to keep changing the plugs to keep that white porcelain white.

Chunk: uh, did you not do actually plug checks, it usually take me hours to get it right

Tyson: Nah, just once, put new plugs in, ran WOT for about 5 seconds and checked the front, it was nice and pearly white like my teefies.

Chunk: Uh, how long had you had the motor in the ski running before you blew the motor.

Tyson: Oh heck, a long time, at least 16 minutes, 5 of those were spent drying the waterspots off the hood after I checked the plug that first time.

Chunk: dude, go back to electric train sets.

 

[Speedfreak]

:haha::haha::haha:Only the names have changed to protect the innocent....

 

[WFO Speedracer]

No the names were changed to protect the guilty.:Eyecrazy::wavey::Eyecrazy:

Also if the engine mfg's name starts with Bomb such as Bombardier you should rightfully assume it to be a bomb as was stated by the name, never try to sue Seadoo for false advertising,they tried tell ya.

 

[Big Kahuna]

I think it was Wedo's Redneck Jetski house that did the work!!!!!!!!!!:spankme::261::slap:

 

[WFO Speedracer]

Sorry I don't work on Superjunks so it could not have been me, unless someone robbed one of my engines out of couch.Besides even the bombs I build don't blow up.Hey BK how bout them Tigers?

 

[sflsurfrider]

he wasnt talking about yamahas. tyson clearly has a kawi, chunk..... i mean wedo.

 

[WFO Speedracer]

Hell I thought Tyson had a knockout punch and bit peoples ears off,I didn't know he was a Kawi rider too,you learn something new every day here I tell ya.It still couldn't have been me unless he robbed the kawi engine out of a couch or one of my personal boats.

 

[Big Kahuna]

Sorry I don't work on Superjunks so it could not have been me, unless someone robbed one of my engines out of couch.Besides even the bombs I build don't blow up.Hey BK how bout them Tigers?

How about them, they won by one dropped ball............. Was not impressed by either team actually!!!!!!!!! thought the Tigers were better than they were.

 

[Scorn800]

some thing like that happen to you b4? just a wild guess haha

Sure did. I learned my lesson the hard way. Always talk to the person that set up your motor before doing anything different.

I disagree with BK about a motor lasting.
If a quality builder set up your motor it should last for a while. The reason your paying a builder is to help set it up. It should last as long as you do what they say and don't sink it, run wrong gas/oil, try to change things on your own or assemble wrong. Granted there are exceptions