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Bonneville towers and Chrysler racers
Can anyone provide some info on Bonneville towers? I have one for a Chrysler and would like more info on them. What all did they make? When did they make them? Does anyone have more info on Chrysler racers than what is in the factory brocures? I have a 105 and a later one that was supposed to have been built my Mercury under the Force banner. Any info is welcome and greatly appreciated.
There Is A Chrysler 105 And 135 Sitting Near Here In Storage But
The two big Chrysler engines sitting here stored are both pleasure engines that are complete and ready to run as such. They were tradeins on new Mercs some dozen years ago and are just sitting in storage where I got my Merc Twister tunnel boat engine from. Now to find some Chrysler tuned exhausts, racing towers and gearcases! What an impressive hydro that green beast is!! That is the kind of big hydro I was hoping to find a while back for the Twister as I am no fancier of tunnel boats anyway.
Some one in the midwestern area has a Chrysler C-Mod engine. I know where there are a number of those sized pleasure engines too. That is worth a lookeesee all by itself. Chryslers enjoyed a good reputation here too and there were a lot around for a long time.
:)
looking for a bonneville tower...
.....I'd appreciate any leads. Thanks!
Gear ratio for the Chrysler racers
Quote:
Originally Posted by Mark75H
T-Rex knows how to make them go fast, but he's not a big historian.
Chrysler built racers from 1968 until 1976, ranging from 105 hp to 150 hp. Chrysler got out of the outboard business in 1983 when they sold the outboard stuff to an investment group that called itself "US Marine". I think US Marine sold out to Merc in the early 1990's. I've heard the Merc/Force racer rumor many times, but I very much doubt Merc had anything to do with any Force racer given the stretch of years between the Chrysler racers and the year Merc acquired Force.
There are a few simularities between the Chrysler racing lower unit and the McCulloch racing lower unit. This is because when McCulloch got out of racing in 1967 their racing R&D team became available and was picked up by Chrysler. The team consisted of Bob Kies, Jack Oxley and Danny Snead. I located and interviewed Kies and Oxley a few years back about their involvement with both companies. The early 105 Chyrsler racers just had the racing lower unit bolted on to a std short shaft powerhead. There were also racers badged as 120 and 135. Next they added the open megaphone exhaust and finally larger carbs, L-shaped piston rings and a higher compression ratio on the 150 hp racer. The early racing lower unit used a fat 7/8" prop shaft and couldn't use Merc Speedmaster props. The 150 type racing lower unit used the same splines on the prop shaft, but had more space between the shaft and exhaust outlet, so a larger diameter prop could be used compared to a Merc Super Speedmaster. There was also a 2" longer racing lower unit for bigger boats with taller transoms (the extra 2" is all under the cav plate). Chrysler never made a big splash in APBA OPC racing, but did very well in outboard drags, holding many speed records over the years.
The Bonneville mid sections were made by Bob Florian in California during the time Chrysler motors were popular and fast at the drag races. Bob also made short mids for 6 cylinder Mercs and 4 cylinder D Mercs; again popular with drag racers. The time frame was probably 1969 to 1972 for all Bonnies.
The Bonneville mids were intended to be used with Merc D clamps & swivel assemblies. The gear ratio is 17:15 (7% overdrive). There were optional 7% reduction gears, but they are very rare.
The most common ratio was the 15:14 (7% overdrive) and the much rarer 14:15 (7% underdrive). Strangely, there are also some units that were made with 19:18 gears (5% overdrive). I wonder why they would bother to make a second ratio that was so close to the standard one? Maybe the original ratio was 19:18 and later changed to the 15:14 to beef them up(???).