Bench flowing carbs (How I spent my Saturday)
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Bench flowing carbs (How I spent my Saturday)
We flowed the carbs with @ 6" because anything over that the flow was 100% of flow. We used a straight 4 hole carb spacer, a full open spacer and a 4 hole machined spacer similar to a HVH but phenolic.
750-1
4 Hole spacer = 84.8%
Full open spacer = 92.8%
4 Hole machined = 95.9%
750-2
4 Hole spacer = did not try
Full open spacer = 90.0%
4 Hole machined = 91.5%
950HP
4 Hole spacer = did not try
Full open spacer = 90.0%
4 Hole machined = 91.0%
Jim thought it was odd that my matching 750's did not flow the same. So of course he had to take to the grinding bench an modify it somewhat. He also hand modified the 4 Hole straight spacer.
750-2
Full open spacer = 92.5%
4 Hole machined = 94.8%
4 Hole hand modified = 94.0%
Jim and I were shocked to see that the 950HP did not outflow my 750's, but as I stated this is an unscientific test. This only proved that my 750's could flow 600cfm easier than the 950HP's. When we started this experiment we were looking to see what % lower my 750's were than the 950's. Because I was going to buy 950HP's at a later time.
Also his 15 minutes of hand work on my carb netted me a 3.3% in flow to almost match my other carb. 3.3% x 600 cfm = 19.80cfm
Experts take it for what its worth or let me know why my findings might be wrong or skewed. I know I was not using full velocity or full cfm for the carb.