how to calculate blown engines carburation?

thnx

ps: no current engine for the moment.know the formula for non-charged.what is it for charged?

Thats easy BIG. Check with Dean at www.nickersonperformance.com he is THE man when it comes to blower carbs.

thnx jdnca1;
cool site,nice products..
but i am looking for a calculation formula..if there is...
thnx

Are you looking for carburation set as jet sizes etc or fiqures on how to calculate what cfm you should run?

how to calculate what cfm I should run?

CFM or what size of carburetor is what I mean. If you are looking at how to set them up jet sizes etc there are many variables that need to be considered. If your guessing I would leave it to the experts.

This is out of an old BDS Blower book I have. What carbs do I need to run and why 2 of them?
The size of carb(s) or CFM required for a given application can be calculated by the following formula:

[(CID x RPM) divided by 3456] x [(Boost divided by 14.7) + 1] = CFM required.

The amount of CFM required will determine carburetor size and quantity. If you try and use a carburetor with less CFM than required, performance and economy will be greatly reduced.

557CI
5600rpm
6psi
1335CFM?

Back4more I question everything to. This formula is out of a BDS Blower book I have. I run a 525ci with the same numbers you have. 2-850's on mine.

ok i know the first part; volumetric efficiency ia taken at %100 in this formula...
according to this back4more should have 1250-1350 ...he has 1335 ..its ok.

paradigm : it looks like you are over-carburated..

why i am asking these questions : reason is :
i saw a 502 cuin blown engine 8 boost with twin 1050 dominators on top of it.its a marrine engine.rpm 6000.
?!?

any comments on this?