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#1
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Yeah I was going to do some more checking on things when I get off work today. I really thought it would run close to 50 wot but Garagenc is saying his runs low to mid 40s with the duo prop set up. I looked at volvo's site and they claim 5% more top speed with the duo prop set up, that puts my speeds close to what he's getting when you factor in 5%. I'm thinking the prop is probably my biggest loss it looks like it is old tech even for a aluminium prop. I'm thinking I could possibly get 40 or better with a new style stainless prop. I will get out my gauges and check compression this weekend which would probably be a good time to change plugs. What are the correct plugs for this engine? The guy I got the boat from said that the engine had been replaced a few years back with another used engine I'm thinking that it could even be a 305 ill run the numbers on it and see what it comes up as. I also want to check for timing chain stretch since i cant seem to get it to run right with 8* timing at idle it wants more advance which makes me think maybe there is some chain stretch also. It runs great and has good oil pressure but I guess it could still be a little tired wont know till I do some tests. As far as the gas is concerned I know I need to drain it I just have to get it out of the lake and find a large enough container to put it in. Thanks for all the info! Does anyone else have first hand knowledge of what top speed I should be seeing?
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#2
08-09-2013, 06:37 AM
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I just purchased a 1986 V20 two months ago with a Mercruiser 260 I/O and it has the Alpha 1 outdrive with a 19P aluminum prop. Engine runs great everything is tuned properly. I get the exact same performance that you are getting, 4200 WOT and 38 MPH on the GPS so that may be what were going to get with this setup. It does get there pretty quick though.
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#3
08-09-2013, 06:42 AM
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I forgot to mention, check your tach for accuracy against a known good tach. If that engine is the original, the factory engines had a real good timing chain, I rarely see them give any problems, if some one swapped in an automotive engine, the chain may be an issue.
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#4
08-09-2013, 08:03 AM
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Well from the few that have this set up sounds like I'm pretty close to where I should be. I think the engine that was swapped in was quite possibly a automotive engine. The reason I'm thinking of chain stretch is that I can't seem to get the timing right. It won't run right without the timing light showing around 29* advance at idle I still have to check and make sure the pointer and balancer match up at top dead center, probably my first weekend project. I tried to set it at 8* but it doesn't want to start with tht timing and at 8* initial I can only get 27mph top speed and forever to get on plane. I don't seem to have any detonation where it is now and I think I'm actually still somewhat retarded as far as what it sounds like now. I will do some more checking and try to get some fresh fuel in it this weekend. I just rebuilt the carb but I need a new secondary metering rod hanger since mine looks slightly bent. This thing has been a can of worms since I got it. Thanks for all the help and if anyone has more performance numbers with this set up I'd appreciate it seems like not many 260hp I/o's are out there. Thanks agian!
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#5
08-09-2013, 08:56 AM
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Look for the serial number on the block Mecruiser has them on the right rear side of block. Providing its a merc.
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#6
08-09-2013, 09:18 AM
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Wdlyle I agree it gets there pretty quick acceleration is great I guess I just expected more top speed. I don't run wide open very often but it's fun to get on it now and then. Pushing 40 isn't bad but 10mph faster would be nice. Either way I'm really happy with my v20!
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#8
08-09-2013, 10:02 AM
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weirdness with timing is more likely to be in the harmonic balancer than the timing chain... tho 29* is a LOT... you ARE checking timing on the correct cylinder arent you?.... had a buddy who always had fords try to check timing on the right front of a chevy once and it didn't work for him LOL
If you pull out #1 spark plug and use a screw driver to feel the top of the piston you can determine if it is at TDC and then mark the balancer in line with the tdc mark.... You can check for slop in the timing chain by turning the crank back and forth by hand with the dist cap off so you can watch the rotor.... there WILL be a little slack but shouldn't be a lot. I haven't had a 260 in a V20 but I did have a '78 merc 898 (198 hp 305) in an arrowglass siesta... 20' deep V cuddy... It ran 40-42 mph with a 14"x19" old school 3 blade stainless prop.
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#9
08-09-2013, 10:12 AM
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Pretty tough to beat a 200hp or more outboard. Especially a new four stroke,you need a worked 350 with around 500hp see back post under Ubhistory He built one put in a V-20 went around sixty mph I believe.
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#10
08-10-2013, 05:01 AM
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Quote:
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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