BLP 4150 Transition Slot Questions
Posted: Sat Sep 07, 2019 11:15 am
Just about have the carb ( mini annulars and merged collectors ) dialed in and was checking the baseplate for transition slot settings before putting it back on the engine when I saw something I haven`t noticed before . I set the primary and secondary slots at .020" and then noticed that on the primary , one of the slots was showing more than the other ..... enough that it was obvious to the eye .
So , it looks like the butterfly shaft may be bent/twisted slightly . Question is , does it really matter ( I think it does as the slots are unbalanced and that`s where the engine spends a lot of time around time around town ) and if so , can the shaft be "untwisted/bent " back ?
I may just change baseplates as I also have only 7" of vacuum at idle ( 1200 rpm ) and to get to that idle speed with the primary TS set at .020" , I have to have the secondary almost halfway into the TS . When both are at .020" , idle is in the 500 rpm range.
I have a spare plate that has 3/32" holes in the P/S butterflies and everything appears to be true on that one . I`m now trying to decide if I want to switch baseplates and what would it do for me .
Thoughts ?
So , it looks like the butterfly shaft may be bent/twisted slightly . Question is , does it really matter ( I think it does as the slots are unbalanced and that`s where the engine spends a lot of time around time around town ) and if so , can the shaft be "untwisted/bent " back ?
I may just change baseplates as I also have only 7" of vacuum at idle ( 1200 rpm ) and to get to that idle speed with the primary TS set at .020" , I have to have the secondary almost halfway into the TS . When both are at .020" , idle is in the 500 rpm range.
I have a spare plate that has 3/32" holes in the P/S butterflies and everything appears to be true on that one . I`m now trying to decide if I want to switch baseplates and what would it do for me .
Thoughts ?