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Thread: 85hp V4 Mod begins
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11-11-2017, 07:31 PM #16
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Yeah but if you cut .016 in half it's .008. Max 'allowed' piston clearance according to OMC is .0075.
Originally Posted by FMP
'71 Glastron V153 - Composite rebuild - Unceremoniously wrecked
'81 Baja 15 SS - "nine-paged" '77 140
'81 Carlson C500 Metric - Currently in foster care
'70 something Speedcraft - Allison 16R clone - Undergoing restoration
'79 Carlson CVZ 19 - Far back burner
WALK TALL AND CARRY A BIG BILGE PUMP
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11-11-2017, 07:50 PM #17
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Phew,lol
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11-11-2017, 09:25 PM #18
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Actually I was being serious. All has to do with bores and diameters I reckon. Think .004 is tight as they recommend for a oversize piston?
'71 Glastron V153 - Composite rebuild - Unceremoniously wrecked
'81 Baja 15 SS - "nine-paged" '77 140
'81 Carlson C500 Metric - Currently in foster care
'70 something Speedcraft - Allison 16R clone - Undergoing restoration
'79 Carlson CVZ 19 - Far back burner
WALK TALL AND CARRY A BIG BILGE PUMP
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11-11-2017, 10:21 PM #19
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I'd bolt the heads back on and go fishing.
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11-11-2017, 10:44 PM #20
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This is the motor that's getting worked to 140
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11-11-2017, 10:53 PM #21
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....and you can't measure clearances with a feeler gauge, besides ring gap.
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11-11-2017, 11:33 PM #22
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And for sure not measured at the crown of the piston.
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11-12-2017, 07:19 AM #23
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Once the ports are brought to 140 specs you need to be right on with piston clearence and ring gap......as they grab rings when sloppy....been there!
JMO (just my Observation)
Gary"12" Super Lite Tunnel (11') "88" 25 Yammy twin carb "BANANA SPLIT"
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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11-12-2017, 07:57 AM #24
5000 RPM
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Thanks for the info guys.
Is the markings normal for the V4 engine ?
I love my Bikini
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11-12-2017, 09:41 AM #25
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Pistons are shaped with a taper with top being much smaller than bottom. So it will show much more clearance at top than bottom in skirt area. Just wanted to clarify my post so my short answer didn't appear to be critical or sound like a jerk.
After I read it, saw it could have been taken the wrong way. So measuring at top of piston doesn't really tell ya much, piston would need to be removed and measured near bottom to get an accurate clearance reading.
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11-12-2017, 10:50 AM #26
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Good point, note the extra top clearance is to soak the heat. Measure forged vs cast and note the difference. Marks in the bore will be gone when you bore it.
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11-12-2017, 01:11 PM #27
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Gary, do you know the stock timing* numbers for the 140 in and out? Originally Posted by olboatman
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11-12-2017, 07:48 PM #28
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No I don't Frank ..... Maybe racervboat will chime in as I'm sure he has them and if he doesn't soon I will contact him. Originally Posted by FMP
Gary
"77" Hydrostream Viper "87" 140 Rude heavy modded w/15" mid, Bobs nose and lwp "DANGER ZONE"
"72" Checkmate MX-13 "80" 75 Rude w/15"mid and Nitro Lu (to be restored)
"Too much is never enough" Keith Richards " Dreams become reality via hard work and perseverance" G.A.Carbonneau
"This coming from an old man that strapped two bananas together, hung a motor on it and calls it a boat" XstreamVking
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11-12-2017, 08:07 PM #29
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I thought to ask, I have an idea but more importantly the build here would probably need to know.
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11-13-2017, 02:18 AM #30
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Poor mans way. Put piston in bore crown first and check top of bore to bottom of piston with feeler gage.
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