Rick Morrison wrote:
>>In answer to your question, will a .060" over bore
>>make your 1800 run hot, the answer is "Maybe"
>
>>The variable is the wall thickness of a particular
>>block. If a block (any block) is bored too much,
>>the wall become thin enough to be pourous (sp?).
>>What that point of "too much" is,will vary from
>>block to block.
>>
>>But generally speaking, the 1800 B series engine
>>has enought meat to handle a .060" overbore with
>>no problems. The fact is, the first "step" in making
>>a big bore out of a B series is to bore .080" oversize
>which will give you about 1920 cc. ... [snip]
>
Following are approximate ... IOW, within a cc or two.
+.020 1822cc
+.030 1833cc
+.040 1845cc
+.060 1868cc
+.080 1892cc
+.130 1950cc <---- 18V w/ sonic testing to insure
adequate cylinder wall thickness
and proper core alignemnt.
Actual bore may vary slightly
depending on piston manufacturer.
> [snip] ...
>>A few of my local club members have done so with
>>no ill effects (other then the fact the car will scare the
>>Hell of you in a straight line!)
>
... ain't it great! ;^)
>> It's very possible the person who told you the car
>>would run hot at .060 over had one done by a less
>>than precise machinist who (1) fitted the pistons too
>>tight (2) bored the block off center, (3) failed to properly
>>clean the block prior to working and the water passages
>>were less than full flowing, or (4) all of the above
>
Well stated ... just thought I would clarify the various
capacities for overboring.
Safety Fast! ... larry.g.unger@lmco.com
'61 MGA 1600 MkII
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