Posted by Bob on January 02, 2016 at 10:43:24 from (64.255.159.192):
In Reply to: for youJohn Deere guys posted by Donald Lehman on January 02, 2016 at 06:49:31:
The "20" series, the first JD's with factory turbos, tended to be more cold-blooded than the older tractors such as the 4020.
In general, higher HP per cubic inch engines with turbos tend to have lower compression ratios than non-turboed engines to compensate for all the extra air the turbo packs into the cylinders when the tractor is loaded/pulling.
I don't for sure that was the case the the DEERE's, as I don't have the compression ratio numbers for both series at hand.
Those engines were particularly sensitive to valve seat recession, which reduced the compression ratio even more.
DEERE later introduced OH kits with the upper piston ring groove raised (which increases compression) and a redesigned combustion "bowl" design. I have seen a wide range of opinions on how much this helped cold starting, though.
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