What should be the compression in 255 SE?

[185utopia210]

I'm going to be looking at some 2011-2012 challenger 180's in the near future and want to do my homework to make sure we get a good boat. Unfortunately the prices have gone up the last couple of years, but I also did sell our Utopia for more than we paid for it after 4 seasons
Does anybody know what the compression should be on the 4-Tec-and should I do it hot or cold? Is there a difference between the 215 and 255 HP?
And other than a look around visually at the general condition, are there any particular items I should be aware of?

Thanks!

 

[delonnelj]

255/260 are noticeably more powerful. They have larger superchargers, injectors, intercoolers and impellers. The computer program could be different as well as the pistons in vs the 215s but I am not sure if they still do that.

 

[delonnelj]

Most dealers don't know crap about seadoo so you have to double check everything. Engine bay lid (sun deck) will have the HP listed in kwh do the conversion to confirm the hp..

 

[delonnelj]

Another tell tell sign is the 255s have white covers and the 215s are black.

 

[delonnelj]

1503 block is used for both sizes 140 is a max compression. I've seen them run well at as low as 128 psi.

 

[delonnelj]

Get the 12 model if you can. Be particular about the hours, and accessories. The table, snap in carpet and snap in cover are huge bargaining points. As the saying goes break out another thousand. Those three will cost about three grand if missing.

 

[delonnelj]

Bearings on the trailer are also important. Open them up and check the condition of the grease. Any signs of water, take off another grand. You don't want to wonder if the bearings are pitted from any water

 

[delonnelj]

I'd request an oil and fluid change, and be sure they use jaso ma (2) oil. Superchargers change it from car oil to motorcycle for the wet clutch. Not to mention the operating rpm is 8000 about 6 times greater than a car.

 

[Chester]

I'd request an oil and fluid change, and be sure they use jaso ma (2) oil. Superchargers change it from car oil to motorcycle for the wet clutch. Not to mention the operating rpm is 8000 about 6 times greater than a car.

The supercharger clutch is nothing like a motorcycle clutch at all. Best to stick with the BRP semi-synthetic.

Chester

 

[JPass]

A quick search for this showed numerous different compression readings. The supercharged motors have less compression than the non-supercharged motors. The range seems to fall between the 120-140 psi range.

When I purchased our boat she was 120 across all 6 cylinders.

Testing on a hot vs cold engine will produce different results as well.

The other thing to check is the difference in psi across the cylinders in the block. There should be no more than a 10% difference between the low and high cylinders.

 

[pvamax]

The supercharger clutch is nothing like a motorcycle clutch at all. Best to stick with the BRP semi-synthetic.

Chester

Many many guys, including myself, have been using this type of oil(motorcycle oil certified for use in wet clutch applications) in brp supercharged boat motors for well over 10 years without issues. It works.

 

[delonnelj]

The supercharger clutch is nothing like a motorcycle clutch at all. Best to stick with the BRP semi-synthetic.

Chester

You don't know much about how the oil interacts with the friction on a wet clutch. It is the same on a SC and on a motorcycle. Go read up. Both oils are ma(2) certified oils I can put my brp 260 oil in my CBR and vice versa. For the record I do. My CBR has 40k miles and my boat engines alone has 30 hours on it from Feb to now. I drive my bike at Usually​ 7000 rpms it gets as high as 14,000rpm. My boat cruises at 59mph at 8000 rpm. Clutches are spinning in excess if 40,000 rpms. You can buy any brand of oil your heart desires but all wet clutch oils need the ma certification to operate properly.

 

[delonnelj]

If you are going to be towing the SE comes with the low tow hook above the deck. If you get the Wake or SP the tower is standard. SP tower is collapsible​ with a Bimini. The dimensions on the 230s are the same I'd guess the 180s too. However the 180s don't come with the wake model mention above. Only SE and SP.

 

[JPass]

My boat cruises at 59mph at 8000 rpm.

I would rephrase that to say she maxes out at 59 at WOT. The true "cruising speed" of a boat is measured where the boat gets the best fuel burn when on plane (usually 55-75% of the max engine RPMs). Cruising speed for our 2012 210SE is roughly 30 MPH.

 

[go_panthers]

Also, using "Eco Mode" on the 210 will find the best cruising speed.

 

[Chester]

You don't know much about how the oil interacts with the friction on a wet clutch. It is the same on a SC and on a motorcycle. Go read up. Both oils are ma(2) certified oils I can put my brp 260 oil in my CBR and vice versa. For the record I do. My CBR has 40k miles and my boat engines alone has 30 hours on it from Feb to now. I drive my bike at Usually​ 7000 rpms it gets as high as 14,000rpm. My boat cruises at 59mph at 8000 rpm. Clutches are spinning in excess if 40,000 rpms. You can buy any brand of oil your heart desires but all wet clutch oils need the ma certification to operate properly.

I understand what you're saying but I do know.
I'm just saying that a motorcycle friction clutch is way dofferent that a supercharger slipping clutch. Apples and oranges.

Chester

 

[delonnelj]

I understand what you're saying but I do know.
I'm just saying that a motorcycle friction clutch is way dofferent that a supercharger slipping clutch. Apples and oranges.

Chester

Apples and Apples that use the same oil. Because​ your contention was it is not the same oil, which was wrong. It is the same certified oil. Slipper clutches are also available to install in your motorcycle just in case you didn't know.

 

[delonnelj]

I would rephrase that to say she maxes out at 59 at WOT. The true "cruising speed" of a boat is measured where the boat gets the best fuel burn when on plane (usually 55-75% of the max engine RPMs). Cruising speed for our 2012 210SE is roughly 30 MPH.

This post was for a comment bout oil who distraced from the OP question which is what the guy should look for in his next boat. My meaning of cruise was meant as below for any disclaimers. My wot speed is 66.

sail about in an area without a precise destination, especially for pleasure.

"they were cruising off the California coast"

synonyms:sail,*voyage,*journey

"she cruised across the Atlantic"

2.

(of a motor vehicle or aircraft) travel smoothly at a moderate or economical speed.

"we sit in a jet, cruising at some 30,000 ft"

synonyms:drive slowly,*drift;*More

 

[Chester]

Apples and Apples that use the same oil. Because your contention was it is not the same oil, which was wrong. It is the same certified oil. Slipper clutches are also available to install in your motorcycle just in case you didn't know.

I do know. Motorcycles use a clutch that is made to hold strong under heavy load. Sea-Doo superchargers spin up to 45,000 RPM and use a clutch that must slip under heavy load to protect the components. During early testing, BRP found that without a slipping clutch, the supercharger shaft would break under extreme load. When the jet pump becomes unhooked at WOT, and then hooks up again (like when you jump waves) the SC RPM would go from 45,000 down to 10,000 - 20,000 in an instant. Without the give of a slipping clutch, parts would break. BRP originally recommended using full synthetic oil and soon realized it was bad for the clutch. They sent out a bullitin requiring all supercharger models to use only semi-synthetic oil. Now you know too.:cheers:

Chester

 

[delonnelj]

Still doesn't change anything. It's the same oil. Period. Let it go.

 

[Jcamaro]

I do know. Motorcycles use a clutch that is made to hold strong under heavy load. Sea-Doo superchargers spin up to 45,000 RPM and use a clutch that must slip under heavy load to protect the components. During early testing, BRP found that without a slipping clutch, the supercharger shaft would break under extreme load. When the jet pump becomes unhooked at WOT, and then hooks up again (like when you jump waves) the SC RPM would go from 45,000 down to 10,000 - 20,000 in an instant. Without the give of a slipping clutch, parts would break. BRP originally recommended using full synthetic oil and soon realized it was bad for the clutch. They sent out a bullitin requiring all supercharger models to use only semi-synthetic oil. Now you know too.:cheers:

Chester

https://www.amsoil.com/techservicesbulletin/SmallEngine/TSB SE-2007-04-19 Sea Doo PWC.pdf

Synthetic is only an issue with the old style exploding ceramic washers.

 

[go_panthers]

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