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Thread: Merc V6 History
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03-12-2018, 02:08 PM #541Screaming And Flying!
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10-21-2018, 09:15 AM #542Screaming And Flying!
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Time to wake up this thread......What do you know about 3.4 motors?
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10-21-2018, 09:34 AM #543Screaming And Flying!
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10-21-2018, 10:52 AM #544Screaming And Flying!
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Early thing as a nudda choice for bigg boats rather than I/o s......JMO. I would like to here from the guy that was there....
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10-21-2018, 04:24 PM #5455000 RPM
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10-21-2018, 08:53 PM #5465000 RPM
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I was there but don't know a lot about it. It was designed by another engineer there at plt. 6. I believe he went to the bigger bank angle to get more room for the exhaust. It just seemed to me like it was a rather bulky, heavy engine with thick sand cast sections. I believe an outfit in England had some say in the design.
Never up --- never down!!
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10-21-2018, 09:01 PM #547
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10-21-2018, 09:09 PM #5485000 RPM
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10-21-2018, 09:31 PM #549Screaming And Flying!
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Cosworth also did some omc loopers
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10-22-2018, 10:33 AM #5505000 RPM
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OK, here's what I remember. When the whole project got underway, we cleared out a storage room behind the tool room at Merc Plant 4 and the tooling engineers started gathering up necessary stuff like boring tools, mills, etc. It was all hush hush, don't remember the year, probably at least a year before production.
ECK foundry in Manitowoc made the first blocks and they were full of porosity, the port openings were floating around, etc. Would get half way thru machining and throw the block out 'cause we bored into a big hole in what was a cylinder wall.
I don't remember who made the call to Cosworth, Charlie McCarthy was involved, can't remember the head engineer, kind of an English fellow, maybe that was the Cosworth connection. Anyway, I was on the 3.4 upgrade group, I was in Product Assurance at the time and did the test program.
I remember someone saying after meeting with Cosworth if they coujld hold +- .020 on the port heights. Corworth answer was "why so much"?
When the blocks came over, Cowsorth had prequalified them for machining, cut the split line and put in the locator holes for the dowel pins. Those blocks were solid, zero porosity. I think Cosworth ended up making the heads also.
First gearcase were having trouble splitting pinions. It was determined that at idle the pinion and drivesahft were so heavy the pinon woud drop down into the gears - hence the double bearing was added to hold the pinion in place - gear life was no longer a problem.
Several things the engine needed that it never got. Except for some race versions - EFI across the board, some racers got it. It needed an up to date midsection - get the trim pump out of the boat. It needed a drop on cowl, again the racers did get this.
It never seemed to get marketed - small market competing against MerCruiser in a lot of cases. In the end, the 3.0L project took much needed resources and money, and the 3.4 died on the vine.
Side note - had them on a big Scarab at our Placida test base, running duals. Was fun to drive, fill it with 400 gallons in the morning, run WOT until noon, come in, gas it up again, and run out another couple hundred in the afternoon. Photo is of the 29' Scarab with dual 200's test counter rotation, the big Scarab was a 34' if I remember right. Shot of me with the '29, probably 1987.Last edited by bernie; 10-22-2018 at 03:32 PM.
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10-22-2018, 07:05 PM #551Screaming And Flying!
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The size of the motor is Huge....The 76 bank is for piston BDC spacing with the long piston length. They were not RPMss monsters... like the 2.4s But I have not seen a parts wreck like the small motors. If pushed the early motors had SPS rod bolt the size of a 2.4 only longer.... they break... the 1985 or so have the same bolts a 3.0 has ... stout. The early ones were cast??? I don't know but any thing Cossy is cast better and lighter....25 pounds. Cossys also had art pistons and tapperd wrist pins. The Merc race motors had steel liners and on T4s thin rings and finger ports. In my opinion the race motors had EFI too less cfm thb....
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11-13-2018, 08:54 PM #552The Historic Photo Master
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12-04-2018, 08:59 PM #5535000 RPM
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Head engineer on the 3.4 as I now remember was Jim Arbuckle.
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08-10-2019, 12:56 AM #554Screaming And Flying!
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Ddddd mammmm need to get this thread going again.............Merc 60 v is a Beaut.... thing....Thanks Warr.....
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08-10-2019, 01:22 AM #555Screaming And Flying!
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Wheatrdurnkorsober........I look at the V6 and see art........such nice.......