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Thread: Chrysler racing 150
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06-28-2018, 10:07 PM #165000 RPM
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I doubt the scallops on a Chrysler have any benefit, needed on OMCs because the v4 configuration causes a restriction. Chryslers are not the same.
I have stopped doing that operation on OMCs because it weakens the piston, causes the skirt to collapse over time. Reliability cost worth the performance increase. Makes no sense on Chryslers because they are straight. Just my opinion.
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06-28-2018, 11:43 PM #17Screaming And Flying!
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Going to agree with you on that for the matching to the lower cylinder/ block. The skirt scallop probably does help in the loading of transfer area right at the ports as the piston turns to downstroke and the scallop is functioning through the ports. Later F4 sportjet pistons had a hole not scallop that aligned with ports. Reasons were varied from lighter to low rpm help for the jet, to balance. L6 Merc configuration seemed to benefit? The bridges removed and area increase as above helps.
The longer stroke bigger bore 103ci when worked to accept stacker pipes responds to transfer and exhaust increase better than just the original port height which is practically identical to the shorter stroke small bore 96ci original 150 stacker. When raising the duration to match the longer stroke the 103ci seemed to get real happy with the stacks and 175/180 psi according to Bill E&T. The upper range of 195psi of the 150 96ci stacker should punch pretty good.
LA sleeve has a large o.d replacement sleeve for the 103ci that can be bored to 3.5" from 3.375 if someone was interested in doing custom piston, work the chamber etcLast edited by FMP; 06-28-2018 at 11:52 PM.
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06-29-2018, 09:09 AM #185000 RPM
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I was told the hole in the piston was for the 55 hp to get it to idle better and didn't do anything for the bigger engines that used the same piston.
how does the 103 ci respond to NOS? and did they change the three cylinder manifold thru the years? I want to make a 4 carb manifold for my 140 hp engine.
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06-29-2018, 11:57 AM #19Screaming And Flying!
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The 55/60 with the trick porting and small powerflow lu a cool engine 78/79 etc. Also had a special tuner.
NOS would need a proper build, forged Wisecos, more clearance, jetting, extra fuel maybe?
If you build a four carb, TC adapters need to be used , building a WB ?Last edited by FMP; 06-30-2018 at 07:33 PM.
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06-29-2018, 02:51 PM #205000 RPM
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TC adapter? I have my dads old race WB down stairs. it has a Al Pagel lower unit on it, I also have his Evenrude with open exhaust ports.
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06-29-2018, 10:07 PM #21Screaming And Flying!
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Sure the triples never had TC carbs , so they used WB adapters. You need to cut the mounting surface off the TC adapter and WB adapter, then weld the TC mount to the WB adapter from the triples.
WB isn't west bend, it's a Tillotson series as is TC. TC are larger .
Why bother with all that work putting the two triple fronts together and then use small carbs? Go the extra step and use TC.Last edited by FMP; 06-29-2018 at 10:42 PM.
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06-30-2018, 06:39 AM #225000 RPM
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ok, that makes more sense. which engines did the TC come on? I have a older 70 hp and a 90 hp charger, do they have different carbs too? My outboards are behind everything in storage, so its not that easy to just look. I just have a 115 blue charger at the house.
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06-30-2018, 07:42 AM #23Screaming And Flying!
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No triples but maybe someone at the r&d made some once for testing? I have only seen one pic of a TC triple, that was an inboard mounted with ex pipe home built, not Force. Maybe I can find it back.
TC , mid to higher hp fours. Some year 115hp 78/79, doesn't matter if Charger. 80/81+ they went back to WB.
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06-30-2018, 10:09 AM #24
Why not just use someone else's carbs?
There are bazillions of 1 3/8" OMC 2 barrels and also Mercs. Cheap too.
An intake for four two barrels would be trick.
Love seeing the hot rod Chrydlers.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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06-30-2018, 10:22 AM #25Screaming And Flying!
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ccc front on a v4...
Its on my list
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06-30-2018, 10:46 AM #26Screaming And Flying!
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Someone must have built one with bigger carbs just replacing the two TC or WB?
I know of a 50mm that bolts right up but throttle had to be moved side to a side, haven't tried it yet.Last edited by FMP; 06-30-2018 at 11:07 AM.
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06-30-2018, 07:39 PM #27Screaming And Flying!
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that mod triple with TC, mounted to stay level when installed in hull
Last edited by FMP; 06-30-2018 at 07:43 PM.
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06-30-2018, 08:16 PM #285000 RPM
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I went thru the old OMC R&D down in Waukegan, they had a V6 sitting on its side mounted to a jet drive in a sprint boat, there was also a wall of V8's , that was a month before they went bankrupt, glad I didn't take the job
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06-30-2018, 08:35 PM #29Screaming And Flying!
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Maybe late one night you could have backed the truck up to put things in storage no don't do that
Last edited by FMP; 06-30-2018 at 08:38 PM.
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06-30-2018, 09:15 PM #30I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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