can i run a blow thru set up on a bridge ported 12a?
12-28-06, 08:33 PM
#1
Rico the rotary freak
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can i run a blow thru set up on a bridge ported 12a?
I purchase a Weber blow thru set up on ebay with a TT2 turbo, can i run this on my bridge ported 12a ?
12-29-06, 02:30 AM
#5
Oops, that carb is way too small, even for a stock port, let alone a bp or blowthru. 45 mm is generally the smallest carb I've seen on a stockport. You need at least a 48 mm, preferably a 51 mm or even one of Gene Berg's modded 62 mm carbs. I have a Mikuni 44 PHH on my 1/2 bp and it's too small. I won't even entertain the idea turbocharging mine without gong to 48 mm or bigger.
12-29-06, 02:34 AM
#6
Terrified.
Originally Posted by trochoid
Oops, that carb is way too small, even for a stock port, let alone a bp or blowthru. 45 mm is generally the smallest carb I've seen on a stockport. You need at least a 48 mm, preferably a 51 mm or even one of Gene Berg's modded 62 mm carbs. I have a Mikuni 44 PHH on my 1/2 bp and it's too small. I won't even entertain the idea turbocharging mine without gong to 48 mm or bigger.
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12-29-06, 02:43 AM
#8
Terrified.
I was just assuming everyone made a direct connection between more fuel meaning more air as well. I didn't mean that the air flow stayed the same and it just drank more gas making it run richer than Bill Gates.
12-29-06, 06:28 AM
#9
Not pointing to any flaws in your reasoning. Most people know that a rotary cannot achieve the fuel efficiency/mileage that modern pistons can. What many people don't realize is the amount of air that a rotary can 'gulp' when compared to a piston engine of similiar cubic in./ccs. You know, the old arguement, 'It's not 1308 ccs, it's 2600 ccs'.
While a 40 mm carb may be more than adequate for 1.1-1.2 litre piston engine, it will starve a rotary. Then it's 'Pop goes the lean boosted weasel and wtf did I do wrong?'
Now, here's a couple of catches. BPs have notorious low vacuum due to port timing and overlap. My 1/2bp-1/2sp pulls about 1/2 the vacuum of a stock port. so to pull fuel through the carb, the carb needs to be larger, but not too large and jetted rich. Take that same ported engine and add boost, the venturies in the carb, it's cfm rating, can be smaller than what one needs to run NA only.
When trying to explain rotary turbo sizing/specs to the import turbo guys, they think we're nuts with how big they they need to be to make decent power.
While a 40 mm carb may be more than adequate for 1.1-1.2 litre piston engine, it will starve a rotary. Then it's 'Pop goes the lean boosted weasel and wtf did I do wrong?'
Now, here's a couple of catches. BPs have notorious low vacuum due to port timing and overlap. My 1/2bp-1/2sp pulls about 1/2 the vacuum of a stock port. so to pull fuel through the carb, the carb needs to be larger, but not too large and jetted rich. Take that same ported engine and add boost, the venturies in the carb, it's cfm rating, can be smaller than what one needs to run NA only.
When trying to explain rotary turbo sizing/specs to the import turbo guys, they think we're nuts with how big they they need to be to make decent power.
12-29-06, 08:30 AM
#10
13b P-port on a budget
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I have a friend who has ran an IDF 40 on a NA stock port. All in all worked great for a DD he didnt want great power just something a little easyer to use and something that was in his budget. It did take him forever to get it to run the way he liked but the outcome was a nice running car. Plus now that he has found the intake for the IDF he is looking at upgrading to the 48IDF. Which will give him add power he wasn't looking for in his first setup.
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