ada head question..

[chips]

looking to get an ada head for my 701 and was wondering what the advantages are with the girdled compared to the non girdled? i searched and couldn't find much info on that.

 

[Matt_E]

A girdled head is supposed to protect the cylinder from cracking. Superjet cylinders with aftermarket exhausts are prone to cracking.

 

[chips]

o i see. so is it worth the extra 70 dollars to get the girdled kit?

 

[Waternut]

This should help you make up your mind... This is what a girdled head helps prevent.

http://www.x-h2o.com/threads/34949&highlight=crack

 

[Matt_E]

o i see. so is it worth the extra 70 dollars to get the girdled kit?

A new cylinder to replace a cracked one will run you more than $70.

 

[chips]

so what causes the cylinder to crack?

 

[tipafew]

I have run a lot of boats with stock milled head and never had an issue. Now I do run a girdled ADA though. These cylinders can crack and it's cheap insurance.

 

[750SX]

so what causes the cylinder to crack?

the extra weight of the exhaust

 

[Waternut]

so what causes the cylinder to crack?

Yes weight of exhaust, vibration, high compression pushing up on the head which in turn yanks on the cylinder. High compression, pipe, and porting are typically the most prone to cracking due to the increased stress.

I haven't seen too many instances of cracked cylinders but then again...just because I don't know anyone with aids doesn't mean I'm going to chance it.

 

[chips]

lol alright ill just spend the extra money and get the girdled. is it best to order it from the ada website?

 

[Mark44]

Whatever you do check your squish when you put it on.

Mark44

 

[chips]

whats squish?

 

[Matt_E]

I have run a lot of boats with stock milled head and never had an issue. Now I do run a girdled ADA though. These cylinders can crack and it's cheap insurance.

I never had an issue with just a B-pipe, either....until I saw my brother in law's cylinder, with a non-girdled pro-tec head and b-pipe crack in half.

 

[chips]

i guess i can understand the weight thing with a factory pipe but with a stock pipe, or riva red pipe like what ive got i wouldn't think that weight would be an issue because it mounts to the top of the head too?

 

[Matt_E]

And what does the head mount to?

 

[chips]

lol alright i get it. just buy the girdled end of story.

 

[chips]

alright got the girdled head odered. what spark plug should i be using??

 

[Waternut]

Typically it will be an NGK BR8ES plug...

 

[parrdaddy]

I cracked the front corner off on 2 sets of cylinders back in the day before I went girdled, haven't had a problem since.

 

[chips]

Typically it will be an NGK BR8ES plug...

ok just makin sure i didnt need a differant plug.