Inline question

[2cycle]

This question has to do with the actual horsepower of the inlines pre- and post- propshaft ratings: How does the 70s 1500 compare with the later propshaft rated 115 of the 80s overall? Has anyone owned and had experience with both (Clams, I know you're out there)?<br /><br />Thanks for any thoughts. Starting to get the fever again as the days get longer.

 

[rabidfish]

Re: Inline question

That early engine was not rated at the propshaft.<br />The later engine would have been since about 1984.<br /><br />However, Mercury especially, but other builders have played with the ratings for years. All trying to get a marketing advantage. (Why does our 150 outrun your 150? because its a 160...? )

 

[2cycle]

Re: Inline question

Would a mid 70s "150" produce more HP than a later propshaft rated 115? I'm guessing that the 1500 would have bigger jets?

 

[Clams Canino]

Re: Inline question

Yes the mid-70's 1500 is stronger than the late 115. The late 115 is about a 135 at the crank, the 1500 is a true 150 at the crank. Lot more than jets different. And HP aside the late 115 is a more stable platform for the long haul. The 1500's are a bit "piston happy" if not treated carefully.<br /><br />-W

 

[2cycle]

Re: Inline question

Thanks - I think I'm clear on it now. So, if I hear you correctly, I can keep my 1500 around for more of the "long haul" by setting/keeping the timing at no more than 21 deg. BTDC, avoiding prolonged periods at WOT, using at least 89 octane, changing the impeller every year,and using high quality oil @ say 40/1?

 

[Clams Canino]

Re: Inline question

Yes.... and decarb it every year.<br /><br />-W

 

[2cycle]

Re: Inline question

Yes.... and decarb it every year. <br /><br />Or just use fully synthetic oil and never have to decarb and also gain 100-200 extra RPMs @ WOT...<br /><br />(Just thought that my post has not generated enough interest thus far hehehe..)

 

[2cycle]

Re: Inline question

Originally posted by 2cycle:<br /> Yes.... and decarb it every year. <br /><br />Or just use fully synthetic oil and never have to decarb and also gain 100-200 extra RPMs @ WOT...<br /><br />(Just thought that my post has not generated enough interest thus far hehehe..)

Wow! No takers on that claim and no resulting skirmishes! I guess all the oil questions have been settled..

 

[Clams Canino]

Re: Inline question

You need fresher bait to troll these waters. <br /><br />-W

 

[2cycle]

Re: Inline question

Originally posted by Clams Canino:<br /> You need fresher bait to troll these waters. <br /><br />-W

Yes, I guess you're right. Back to the drawing board after trying to inject some life into the off season..