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Sonic 26 Prowler Low Compression

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Old 07-20-2009, 10:24 PM
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Default Sonic 26 Prowler Low Compression

My buddy went to buy a mint 99' Sonic 26 with 502mpi and trailer for 25,700 on Sunday. We did a compression test and one cylinder was half of the others. Do you think this is in the valves...head job? Or is it rings? Is the boat still a good deal and the owner did say he'd consider a lower offer to leave room to fix it. The boat did porpoise alot and he didnt like that but everything I've been reading looks like its a great boat. Thanks for all the input
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Old 07-21-2009, 12:07 AM
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Seriously, factor in the cost of a complete rebuild, then add about another 25%. That's for all the crap ya find after you pull the motor apart. There are a ton of great boats out there for reasonable prices. Don't buy a problem unless it's a GREAT deal.



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Old 07-21-2009, 09:39 AM
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???
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Old 07-21-2009, 10:17 AM
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I'd have to side with Darrell on the "consider a full rebuild" cost. The motor is 10 years old, there is no need to fix only one cylinder on a motor that has that many hours.

The porpoising could have been from a lack of power out of that cylinder though!!

Knock the cost of a full "stock" rebuild off the price and you've got yourself a deal.
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Old 07-21-2009, 11:35 AM
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I've put a few posts up about Sonics and porpoising. If you do a search, you will come up with some info. It has to do with the notched transom, and the boat running out of hull once it gets up on plane. It's only a pitfall in smooth water, and you can dial it out once you know the boat.
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Old 07-25-2009, 09:23 AM
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did your friend end up buying the sonic?
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Old 07-25-2009, 07:07 PM
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No he passed....really didnt like the way it rode and then the low compression was the clincher. I thought it was a good deal at 25k. He's still looking................
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