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Tried the clear line and the AAP was leaking. I replaced it with a fresh one I had in a rebuild kit and now it runs terrible! Maybe the new one leaks more, I don't know. I'll have to get back to you on this...
... A stock Toyota 22R head will flow between 130 CFM.So the carb will flow more than the engine and way more than the head....If you knew the formulas, test procedures, and all variables, what would you do with that data?Gnarls.
Isn't that 130 cfm per port/cylinder? If so, then the engine can still flow 200+ CFM assuming a minimum of 85% VE at 5000 RPM.As to the second question I quoted: Geek out. It's what I do.
- Plainview - The only numbers I have are what have been thrown about in this thread. I have no idea what a 22R or 20R head flows. I saw your post above where you mentioned 130 cfm, which I can only assume is an intake port... I'd find it hard to believe one of these ports flows less than that. I've never seen any flow data on a Toyota head.
- Plainview -I'm actually kind of surprised by this. Toyotas have a pretty big following, the 22R/E is an extremely popular engine, they made millions of them, and there are a lot of people still building and modifying them today. That someone hasn't plopped one of these heads on a flow bench and published the results is, well, confusing. Maybe slightly less confusing is the idea that someone has indeed done this and my lame google-fu just hasn't turned it up. Links welcome!
- Plainview - In my other life, which consists of old American musclecar performance, my preferred cup of tea is Pontiacs. A Pontiac V8 hasn't rolled off the assembly line since 1981 and those were the lame 301s that no one cares about. A desirable Pontiac V8 hasn't been produced since '78 and yet there is tons of data out there about those engines. Lots of people have flow tested factory heads in both stock and modified forms and published the results.
- Plainview- The engine airflow demand equation is one that H8PVMNT posted and I also found it on the web when googling "engine airflow demand." I don't know where or how the constant in that equation is derived, thus my question above.
I'm just a bit geeky about engine performance and I'll pursue design questions & performance parameters as far as I think it makes sense to. I understand a lot of the basics about how port volume, cross section, valve sizes, etc. play into performance *in general* but I'm not an engineer, just an enthusiast who likes to understand the math and the logic behind the story he's being told.
-Plainview- With the 22R/E we're dealing with a ~150 ci engine. Unless there's something about the design of the heads that prevents it, I'd think it should be easy to get into the 125-140 horsepower range with these engines and still enjoy good cold starting, low speed drivability, and broad torque bands. Or maybe the heads just suck, along with the commonly available piston designs, and wishing for more than 120 HP is a fool's dream...?
This is a great thread! My Weber 32/36 is pissing me off so think I'll play around with the old Aisin and see how it stacks up.Couple questions/thoughts about airflow and CFM ratings.What is the basis for the formula you use to calculate the airflow demand of your engine? I found the same formula online but not sure how the numbers are arrived at and no time to research at the moment.CFM ratings of carbs are usually determined at a specific pressure drop. Different manufacturers may use different numbers. I wonder what Aisin uses?I gathered from the posts in this thread that your engine has a 20R head and an aftermarket cam...? Do you have a link to your engine build? Thanks!
OK you asked for it... http://board.marlincrawler.com/index.php?topic=97297.0I started with a fresh stock 22r setup and swapped a 20r head and an adjustable timing gear this winter when my cheap aftermarket head gasket let go. Cam is a stock 22r/re profile. Fiddling with the cam timing did make noticeable changes in the seat of the pants driving experience. I highly recommend an adjustable cam gear.There is a lot of living in that thread. You will see the more recent engine changes in the post from about January 17 on.CFM formula is just the standard one floating around on line and on carb websites. Not sure it it's correct, the 20r carb experiment I did would suggest otherwise .
I saw in the latest issue of 4WD Toyota Owner that low range off-road now offers a reproduction aisin carburetor. So no need to dig through wrecking yards to try to find a salvageable unit. I actually enjoy digging through wrecking yards though. http://www.lowrangeoffroad.com/toyota-22r-new-reproduction-replacement-carburetor.html
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