Compression myth.....
01-22-2011, 05:04 PM
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Compression myth.....
Hey so I just got a new (to me) carberated motor for my rig. I want to switch it over to efi (what the truck came with originally). A wile back I had heard from a friend that an efi engine might not have the same compression as a carberated one ... is this true?? I personally don't see how this is possible but I just wanted to double check. 
Thanks guys 
Thanks guys
01-22-2011, 05:13 PM
#2
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nah people swap all the time...and ive never heard of different compression ratio's effecting it? pretty sure there the same if its a 22r...carb or efi...turbo is a different story
01-23-2011, 07:32 PM
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x2 on the RTE... As far as I know the only engines with different compression ratio's are RTE's and a 20/22r Hybrid...
PS, and any collaborated effort with either an RTE head or pistons.
PS, and any collaborated effort with either an RTE head or pistons.
Last edited by tried4x2signN; 01-23-2011 at 07:33 PM.
01-24-2011, 05:43 AM
#5
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compression ratios for toyota engines. http://www.toyoland.com/engines.html Some are missing I know.
Last edited by xxxtreme22r; 01-24-2011 at 05:46 AM.
01-24-2011, 07:49 AM
#7
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Some information below as well:
http://www.off-road.com/trucks-4x4/t...ion-18589.html
http://www.off-road.com/trucks-4x4/t...ion-18589.html
22R (Carb), 2367 cc disp, 9.0:1 compression, 100 hp
22RE (EFI), 2367 cc disp, 9.4:1 compression, 116 hp
22R 81-83 2367 96@4800 129@2800 9:01
22RE 83-86 2367 105@4800 137@2800 9:01
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01-24-2011, 04:28 PM
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never heard of a 100 hp 22R... It's always been 96.
And that's further backed up in my Chiltons.
And that's further backed up in my Chiltons.
01-24-2011, 08:41 PM
#9
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The higher the compression ratio, the more sensitive the engine becomes to ignition timing and Air/Fuel ratio. As those things become computer-controlled, it becomes possible to up the CR without risking longevity issues.
So yea, typically speaking, a carbed engine will have a slightly lower CR than a FI version.
This doesn't mean they can't be run in the other configuration. But it does mean that a Carbed engine running FI will not run quite to it's potential, and an FI engine with a carb will be just fine, as long as it's kept in adjustment.
So yea, typically speaking, a carbed engine will have a slightly lower CR than a FI version.
This doesn't mean they can't be run in the other configuration. But it does mean that a Carbed engine running FI will not run quite to it's potential, and an FI engine with a carb will be just fine, as long as it's kept in adjustment.
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