Author Topic: Thinking about getting bigger cam??  (Read 118554 times)

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Plainview

  • Offline Rock Master
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Re: Thinking about getting bigger cam??
« Reply #240 on: May 15, 2017, 09:58:11 PM »
The baseline would be a stock engine and the components Toyota put into it.  This would not be subjective.  It appears the problem is finding this information.

Did Toyota not publish cam specs?  Do the FSMs not have that information in them?  That would be the most authoritative resource.  The link you posted above doesn't really contain enough info on the cams, as you surely know.  No lobe centerlines, no duration @ .050", etc.  I also find it really odd that the intake and exhaust durations are reversed from carb to EFI and that the Carb cams had quite a bit more intake duration.  Is that possibly a typo?

Is it possible to still order a stock replacement cam from Toyota?  If so, then someone could measure it to find out what it really is.

Other information is also needed.  What is the (designed) combustion chamber volume of stock heads (20R, 22R, 22RE), what dome or dish volume did stock pistons have, etc.  I'd guess a lot of that is in the FSMs.

You say you entered all the parameters for the 22R head in the Engine Analyzer.  Does that mean you CC'd a port and measured it's length and diameter?  I'd think that measuring average port diameter and even port length might be difficult given the goofy 22R head design.

Big kudos to you if you've gathered all this data.  Have you published it on the web anywhere (links?).

Understand, I'm just searching for info and asking questions here in the spirit of sharing info and learning.  Cheers!
'84 Xtra Cab Project:
http://board.marlincrawler.com/index.php?topic=100651.new#new
Parts Wanted:

- Un-cracked dash pad (do they exist?)

 
 
 
 
 

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