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#1
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Prop question Inline 165
I have an Inline 6 mercruiser with a 14.25x17 big ear aluminum prop.
The motor seems to be running strong,timing etc all good yet I am only hitting 3400 rpm,speed around 30mph max with 2 people. Any ideas if I need to re prop or look for something else to get my rpm's up,or leave as is,TIA.
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73 v20 cuddy inline 6 
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#2
06-01-2017, 05:51 AM
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do a compression test and spark check before you go any further
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#4
06-02-2017, 05:50 PM
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I had the samr srt up on my V and ran a 14x15 prop it was a bit slower on the top eand but I comercil fished t that time and cvarry alot of weight, was great out the hole!!
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1986 V20  Old Fishermen never die, we just SMELL that way!!
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#5
06-05-2017, 05:51 PM
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so i ran a compression test
cyl 1-105 cyl2- 95 cyl3-95 cyl4-100 cyl5-100 cyl6-100 all a little low I would say but pretty equal.This was on a cold engine,i may retry it after running for a bit. Tested spark all cylinders reading 12kv at the plug. I also rechecked timing and found it 1.5 degrees retarded so I adjusted that,checked advance and that is functioning.
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73 v20 cuddy inline 6
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#7
02-10-2018, 01:08 PM
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Sir What prop did or are you running ? I have a 1974 v-20 step with the inline 6 cly as well. I want to replace prop mine was reworked from several years ago and the co is out of business now . 14" x 19.. If memory is correct had change to 20 degree and some cup added any suggestion would be helpful.. Trans Yank
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