Quick test for Chrysler Twins

Engines, Shafts, Steering, Struts, Rudders, etc.
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bill
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Quick test for Chrysler Twins

Post by bill »

Fastjeff wrote the following:

Re: Chrysler engine specs/timing



Lots of things make for a lack of WOT rpm: engine tune, boat hull condition, props (pitch and condition), overloading, etc. That said, if your boat does NOT labor getting on plane, or holding a plane, then I wouldn't be so concerned about that 3,400/ 3,600 max rpms. (Mine makes about 3,900 tops.)

Have you tried the Fastjeff Dyno Test? To wit:

1. Set boat on plane at a comfortable cruising rpm (say, 2,500 for this case)

2. Set both engines close to 2,500

3. Open the port throttle all the way, wait until the rpms top out, and record the number

4. Return to the 2,500 cruise rpm, then repeat the above for the other engine.

If one engine tachs out much lower than the other you have a problem there. It could be the engine itself or a bad prop--you'll have to determine this.

Jeff

BigM
Thanks Jeff
bill
Former owner of
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired[/color]
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