On Sun, 9 Sep 2001, Walter Prechsl privat wrote:
> thanks, for all your extensive explantions about xpag-xpeg!
>
> but what i didn t got completly:
> - is there a diffrence, which can be seen outside the engine?
That depends on what you mean. Externally the XPEG looks just like the
XPAG/TD2 (late TD) and XPAG/TF. That means it does NOT look like the XPAG
(TB/TC) and XPAG/TD (early TD). The most visible differences are:
* The XPAG & XPAG/TD block has a big octagonal "MG" logo cast into the
left side of the block near the front. The XPAG/TD2, XPAG/TF & XPEG don't
have the MG logo.
* The XPAG & XPAG/TD use an oil filter that is separate from the oil pump.
On most XPAG/TD2s, the XPAG/TF & the XPEG the oil filter is integral with
the pump.
* The XPAG & XPAG/TD use a 4 quart oil sump. The XPAG/TD2, XPEG/TF & XPEG
use a 6 quart sump.
If you want to disguise an XPEG as an XPAG you can (with a bit of minor
machine work) use the early-style oil pump and oil filter, and of course
you can use the smaller sump. I suppose you could do something to fake
the MG logo, but it's pretty much hidden behind the generator so why
bother.
> - is xpeg really another casting than xpag? or did they use blocks
> with a accidential thicker cylinder wall as base for the 1500 bore?
It's an entirely different casting. The XPEG casting is based on that of
the XPAG/TD2 and XPAG/TF, but the front and rear cylinder pairs are
siamesed. That means there is no water passage between cylinders 1 & 2 or
between cylinders 3 & 4, unlike the XAPAG which has water passages between
each cylinder. The siamesing was done to allow adequate cylinder wall
thickness with the larger XPEG bores.
--
Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271
Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E
fold@bcpl.net