Prechamber Mod "Flame" Front
Prechamber Mod "Flame" Front
(01-23-2011, 11:11 AM)ForcedInduction(01-22-2011, 05:52 PM)DeliveryValve ...
Quote:My understanding is the stock Prechambers are just fine for higher HP output and any modification would hinder and not improve performance.They are, you're correct.
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[(01-29-2011, 09:11 AM)ForcedInduction [quote='yankneck696' pid='23822' dateline='1296308579']Also, Hercules stated that on an otherwise stock engine, that chamfering the holes on the outside benefitted.A bell-mouth form will improve flow efficiency into any tube, its simply not cost-effective for a manufacturer to do that on a large scale production. Increasing flow efficiency is a good thing, increasing flow volume isn't (in this case).
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(01-30-2011, 05:28 AM)Hercules What prechamber best to mod. (my opinion )1984Ca.or 1985Ca.and Fed. My reasoning,this information from 1984 Mbz new modler year book. Title: prechamber,to reduce smoke emissions at partial load, the prechamber has been modified as follows:
Nozzle seat 1 mm deeper
Bore in upper half enlarged from 8 mm to 14 mm
Production phase-in:
California version at start of model year.
Will be gradually phased-in on Fed.version engines. Pertaining to 617.95 engine
Have cleaned,reset,or ( rebuilt) hundreds of Mbz nozzles,these gave the least amount of troubles.
Also set pressures at 950lbs +0- best performance,smoke levels.
(01-23-2011, 11:11 AM)ForcedInduction(01-22-2011, 05:52 PM)DeliveryValve ...
Quote:My understanding is the stock Prechambers are just fine for higher HP output and any modification would hinder and not improve performance.They are, you're correct.
....
[(01-29-2011, 09:11 AM)ForcedInduction [quote='yankneck696' pid='23822' dateline='1296308579']Also, Hercules stated that on an otherwise stock engine, that chamfering the holes on the outside benefitted.A bell-mouth form will improve flow efficiency into any tube, its simply not cost-effective for a manufacturer to do that on a large scale production. Increasing flow efficiency is a good thing, increasing flow volume isn't (in this case).
...
(01-30-2011, 05:28 AM)Hercules What prechamber best to mod. (my opinion )1984Ca.or 1985Ca.and Fed. My reasoning,this information from 1984 Mbz new modler year book. Title: prechamber,to reduce smoke emissions at partial load, the prechamber has been modified as follows:
Nozzle seat 1 mm deeper
Bore in upper half enlarged from 8 mm to 14 mm
Production phase-in:
California version at start of model year.
Will be gradually phased-in on Fed.version engines. Pertaining to 617.95 engine
Have cleaned,reset,or ( rebuilt) hundreds of Mbz nozzles,these gave the least amount of troubles.
Also set pressures at 950lbs +0- best performance,smoke levels.