Compression

[mobgod]

Hi all i'm new to the game need to know what should be the Compression on a 200TLX77C cant seem to find the info for this

 

[BonairII]

Re: Compression

Did you do a compression check yet? If so, what did you get?

 

[mobgod]

Yes I did was 80

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[mobgod]

Can anyone help me out with this ?

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[Solittle]

Re: Compression

Some patience would be in order me thinks.

You said your compression was 80 - - For meaningful feedback you need to provide values by cylinder for all six.

 

[mobgod]

Some patience would be in order me thinks.

You said your compression was 80 - - For meaningful feedback you need to provide values by cylinder for all six.

Can you please explain what you mean by that

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[wilde1j]

Re: Compression

Check compression for each cylinder!

 

[emdsapmgr]

Re: Compression

If that engine has the stock 456/457 heads, you should get about 110 lbs on each cyl when cranking.

 

[mobgod]

If that engine has the stock 456/457 heads, you should get about 110 lbs on each cyl when cranking.

Ok how do I check to see what heads I have

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[nwcove]

Re: Compression

geez......just check compression on all cyls and post back, it can be narrowed down after the results

 

[mobgod]

geez......just check compression on all cyls and post back, it can be narrowed down after the results

I did that already said I'm getting 80

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[emdsapmgr]

Re: Compression

The part number of the heads is cast into the side of each casting. Look for the numbers: 323456/457. I'd suggest retesting with another compression gauge. Not all of them read the same...

 

[mobgod]

The part number of the heads is cast into the side of each casting. Look for the numbers: 323456/457. I'd suggest retesting with another compression gauge. Not all of them read the same...

Ok thanks but I think my numbers are different does that matter also what should it read for the psi

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[nwcove]

Re: Compression

yer gettin 80psi on all cyls?

 

[mobgod]

yer gettin 80psi on all cyls?

Yes

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[emdsapmgr]

Re: Compression

It absolutely makes a difference in what heads you have on that powerhead. In the mid 80's OMC went to the low compression "bathtub" heads on many models. They run significantly less compression, perhaps even down to 85-90 on each cyl. If you have those low compression heads on your engine, it's important to know that-it will tell you if you have a possible internal powerhead issue, or if it's just normal. If you are running stock factory carbs and jets, it won't run well on those low compression heads. Poor holeshot and weak midrange are symptoms.

 

[mobgod]

It absolutely makes a difference in what heads you have on that powerhead. In the mid 80's OMC went to the low compression "bathtub" heads on many models. They run significantly less compression, perhaps even down to 85-90 on each cyl. If you have those low compression heads on your engine, it's important to know that-it will tell you if you have a possible internal powerhead issue, or if it's just normal. If you are running stock factory carbs and jets, it won't run well on those low compression heads. Poor holeshot and weak midrange are symptoms.

Ok so the best thing for me to do is get the model of the heads and post back correct

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[mobgod]

Hi again guys can you tell me a good place to get plugs for my motor west marine wants to much money any online place

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[mobgod]

Not sure if anyone seen my post can someone point me to a good place to get spark plus got this motor I know I need ql16v but west marine wants to much money

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[BonairII]

Re: Compression

You need to get yourself a service manual.