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

 

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

 

K thats kinda what I thought... Thanx

 

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.

 

compression ratios for toyota engines. http://www.toyoland.com/engines.html Some are missing I know.

 

Some information below as well:
http://www.off-road.com/trucks-4x4/t...ion-18589.html

 

hmmm conflicting info: Not that I am saying off-road.com is wrong though.

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

 

never heard of a 100 hp 22R... It's always been 96.

And that's further backed up in my Chiltons.

 

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.