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12-10-2017, 05:02 PM #1Team Member
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'75 high compression V4 crossflow intake stuffers and pump gas?
So I have this '75 bubble back 135, totally stock. Used to be our daily driver family boat motor (on our 16' Sidewinder LowPro clone). Haven't really used it since a couple of years ago when we started using our 18' Bahner bowrider with a 2.0L 150.
Anyway, so two years ago just after I last used my V4 135, I took off the intake and put some Chris Carson reeds into it. While I was at it, I put in some of those intake stuffers that I had lying around, the kind that came in the '77 140hp.
My question is, since I pretty much only run 91 pump in that motor, do the stuffers increase my risk of detonation? It is generally run on Lake Mead which is about 1100 feet above sea level. I have a '93 bubble back (115 hp) that I can put them in, instead, if that is a better match... And it sounds like it probably is.
-PeterLast edited by pcrussell50; 12-10-2017 at 05:16 PM.
"padded wonder"
__________
the wet:
Hydrostream Viper, 140 v4 crossflow, some Raker props
16' Baja/Tahiti/Sidewinder clone, 135 v4 crossflow
17' boston whaler alert, 90 merc fourstroke
13' boston whaler, 40hp yamaha
the dry:
2003 bmw ///M5
1993 mustang/griggs racing road race car
and a handful of clunkers
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12-10-2017, 06:22 PM #2
The stuffers won't be the problem, it will be the higher compression (if it doesn't have the thicker head gaskets) and the high ring pistons in the 135............ 91 should be ok, bump the timing back a couple degrees to be sure
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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12-10-2017, 06:37 PM #3Team Member
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Great tip as always, 'Bum. Where do I get the thicker head gaskets? Part number? ProMarine maybe?
EDIT: These? http://parts.promarineusa.com/CGI-BI...AF202D+M50+ENG
-PeterLast edited by pcrussell50; 12-10-2017 at 06:45 PM.
"padded wonder"
__________
the wet:
Hydrostream Viper, 140 v4 crossflow, some Raker props
16' Baja/Tahiti/Sidewinder clone, 135 v4 crossflow
17' boston whaler alert, 90 merc fourstroke
13' boston whaler, 40hp yamaha
the dry:
2003 bmw ///M5
1993 mustang/griggs racing road race car
and a handful of clunkers
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12-10-2017, 07:15 PM #4Screaming And Flying!
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High ring, hc heads, gaskets what's the cranking psi?
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12-10-2017, 07:37 PM #5
The '75 135 should not have high ringers but the '77 140 did. If you have ever noticed, there are hardly any 140's still running (original). I still see old 85 and 115's running. Between the bigger ports, the high ringers, and the extra H.P. most are long dead! They told us at OMC school to turn the timing back 2 degrees. I miss the cross flow motors from the '70's. Excellent power to size ratio and simple to troubleshoot and fix.
1970 15' Allison/135 Chrysler stacker
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12-10-2017, 08:20 PM #6Screaming And Flying!
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Not too many originals but it had been 40years. So hc motors are 155-165 psi? If you don't feed them good fuel ...... 165-175 is max for 93-94 gas in my Chryslers with lots of ign. Don't load them , let them spin. That's at 583' .
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12-10-2017, 09:22 PM #7Team Member
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Glad it's not a high ring piston. But I suppose I should check compression before I go to thicker head gaskets or anything else, just to get a ballpark of where I am in cranking pressure. Thanks, so far, guys.
I have a couple hundred hours on this motor, and who knows how much before I bought it? Most of it at family recreational boat rpm's. But I've done a few full power/speed runs. It GPS'd in the Sidewinder LowPro, with just me, at just under 55mph. And was juuust getting "walky", but still super easy to control at that speed. Glad it stayed together.
-Peter"padded wonder"
__________
the wet:
Hydrostream Viper, 140 v4 crossflow, some Raker props
16' Baja/Tahiti/Sidewinder clone, 135 v4 crossflow
17' boston whaler alert, 90 merc fourstroke
13' boston whaler, 40hp yamaha
the dry:
2003 bmw ///M5
1993 mustang/griggs racing road race car
and a handful of clunkers
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12-10-2017, 09:33 PM #8
They went to thicker head gaskets when the government took the lead out of the gas..............
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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12-11-2017, 12:24 AM #9
I've had the same questions about my 1975 135 Johnson on my 16' Hustler Victor. Mine is also stock and I'm running 91 octane at 40:1 TCW3 oil. So what is the consensus? Go with the thicker head gaskets...drop timing 2 degrees...run 91-93 oct...all of the above or a combo of some of them???
Hustler 15' Wildcat / Merc 80
Hustler 13' Wildcat / Merc 80
Hustler 13' Picklefork (Experimental) / Merc 80
Hustler 16' Victor / Evinrude 85
Hustler 15' Tunnel / Evinrude X115
Hustler 17' Lark / Suzuki 140
Ranger 17' Aztec / Merc 115
Hustler 16' Victor
Hustler 16' Victor / JohnRude 135 (current and restored)
Hustler 15' Family Tunnel / Johnson GT115 (current project)
Hustler 16' Victor
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12-11-2017, 11:24 AM #10
As FMP said, don't load them. I have seen people run a bigger prop because it gives them 2 mph. Better off without that extra 2 mph and let the motor turn up where it should. The bass boat crowd is bad about this. They want the biggest prop they can turn for the top end speed, then when they are not fishing they pull the kids on a tube.
The older cross flows have big jets so they are getting plenty of fuel. Turn timing down 1 to 2 deg. and run a can of engine tuner through it once or twice a year. Nice thing about the cross flows, you can easily take intake transfer covers off and do a good inspection of the pistons, rings and cylinders.1970 15' Allison/135 Chrysler stacker
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12-11-2017, 11:28 AM #11Screaming And Flying!
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What's psi spec for those hi comp v4?
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12-11-2017, 11:43 AM #12
The older engines and the high ring engines would have 150 to 160. My dad had a '79 85h.p. That was a strong 85 but it had high ringers in it and we pulled them out before they failed.
1970 15' Allison/135 Chrysler stacker
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12-11-2017, 11:50 AM #13Screaming And Flying!
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I run the Chryslers with Wisecos. Not high ring but still 165+ with just a touch from the head. Factory spec is 155-165, some had high ring some not. Also have a three ring 105 that's 145psi, will never drop a psi with that one, also doesn't have the front case stuffers but you wouldn't know it the way it runs.
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12-11-2017, 12:40 PM #14
Just did a compression test on my 135 ( was winterized and fogged 3 weeks ago) and it had 125# on 1,2 and 4 and 130# on 3....this is with the gauge I normally use now.....I have 4 gauges and they all read differently. Once I do a compression test on a motor that had water in it it seems to kill the gauge. This gauge hasn't been subjected to water "yet"! This test was done cold and throttle plates closed...tried opening wot and only seemed to raise them 5#s or so...how are you guys testing compression? Normally when I do a comp test its cold and am just checking cyls for any low cyls then delve into them if needed. I strongly agree with the use of engine tuner...have brought both ob's and sterndrives back to life with it.
Hustler 15' Wildcat / Merc 80
Hustler 13' Wildcat / Merc 80
Hustler 13' Picklefork (Experimental) / Merc 80
Hustler 16' Victor / Evinrude 85
Hustler 15' Tunnel / Evinrude X115
Hustler 17' Lark / Suzuki 140
Ranger 17' Aztec / Merc 115
Hustler 16' Victor
Hustler 16' Victor / JohnRude 135 (current and restored)
Hustler 15' Family Tunnel / Johnson GT115 (current project)
Hustler 16' Victor
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12-11-2017, 12:53 PM #15Screaming And Flying!
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I do it cold , throats wide open, best would be no fuel but don't like to spin it dry, strong battery. Gauge should top out 3-4 revs. Fogger will increase your numbers.
130 fogged doesn't seem too high , I'd get it up another 25 psi but doesn't mean you should.
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