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Old 01-05-2009, 11:12 PM
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retired mechanic needs question answered

this may sound stupid but what is a "splayed main cap" ? and if you have pics that show the difference please post.

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Old 01-05-2009, 11:37 PM
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Not a stupid question at all...

You know what a 4 bolt main looks like, well, take the OUTER bolts (the shorter ones) and ANGLE (or splay) them outwards. It creates more tension at the main cap for stability, that's all.

Usually this is done to a 2 bolt block seeing as the 4 bolt block has the bolts already going in the same plane, or parallel.

Some aftermarket blocks are splayed like this already. It is thought that the outer splayed bolts are threading into more iron also, thus stronger.

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Old 01-06-2009, 06:01 AM
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The current crop of GM's "LS" series engines have main bolts that come in at 90 degrees to the main caps through the side of the block. I have heard some refer to that as "splayed", but IMO that is not correct, shouldn't it be "cross bolted"?

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Old 01-06-2009, 01:29 PM
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This is another term whose mis-use is makin' me nuts, like "ported and polished". That's a term left over from the days of the flathead, but nowadays, any kind of work on a head, even a simple bowl blend, automatically deems the head having been "ported and polished". Makes me nuts.

Splay. adj. 1. spread or turned out. 2. clumsy or clumsily formed; awkward. ----v. 1. to spread out or apart. 2. to slant or slope.

Generally, the splaying of the outer main cap bolts on an engine block to an angle of 18-20 degrees differential from the inner main cap bolts.

Go to google and click images in the upper left corner. Enter splayed main caps into the description and click search. You'll find a myriad of examples. You'll also find mis-use of the term, with the word splayed applied to 4-bolt main caps with parallel main cap bolts.....

Agree with Vince about "cross-bolted". If the 3rd and 4th bolts on any one cap come in from the side at a 90 degree angle to the primary 2 bolts, then they are not splayed, the cap is cross-bolted, a term coined by Ford Motor Co. when they cross-bolted the FE block in the early 60's.

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Old 01-06-2009, 01:35 PM
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Quote:
Originally Posted by techinspector1
This is another term whose mis-use is makin' me nuts, like "ported and polished". That's a term left over from the days of the flathead, but nowadays, any kind of work on a head, even a simple bowl blend, automatically deems the head having been "ported and polished". Makes me nuts.

.....

ok, so if i have done some grinding, and modified the ports, and used whatever means necessary to polish my cylinder heads, what would you suggest I call it???
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Old 01-06-2009, 01:57 PM
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Call it anything you want to. They're YOUR heads.
Please understand that this term is usually used by some bumpkin in Burnt Stump, Arkansas who has seen it in print and uses it indiscriminately in an attempt to wow the geeks down at the Sonic. They'd give you the "deer in the headlights" look if you explained that the combustion chambers and exhaust runners can be polished if you want to spend the time doing so, but that the intake runners are left rough to help prevent puddling at the boundary layer.
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