First post in a while about conversions...
If you were thinking of a Eurovan conversion--how hard would it be to adapt an ALH, rather than an AHU?
From another thread elsewhere I read this:
(Reason for the thought process--there seems to be a dearth of older Passat/Jettas around to find a likely conversion engine, but I have found a decent 1998 Beetle within striking distance (which I understand does not have the immo...))
Found this thread here that seems contradictory on the motor mount bosses? This thread eems to conclude that either would do for a Vanagon conversion depending on availability. The 'internal' waterpump on the ALH does seem a little annoying though...
http://forums.tdiclub.com/showthread.php?t=262343
If you were thinking of a Eurovan conversion--how hard would it be to adapt an ALH, rather than an AHU?
From another thread elsewhere I read this:
So the physical mounting would be more of a challenge, I'm assuming--since the factory brackets used to mount the AHU in other Eurovan conversions would not work?The block of the ALH was changed and lost the MK1 mounting boss for all four bolting mounts. The block is slightly longer in the main run than the 1z/AHU units. The block is supposedly "reinforced" in the ribbing more but uses the same internals as the AHU (1z exception because it has the cast pistons).The vac. pump is relocated and no longer the traditional vac. pump that is driven off the int. shaft on the earlier 1z/AHU motors and the water pump is internal, driven off the timing belt. The head is also different on the ALH motors, with the new block it has a wider "central galley" oil return in the head vs. the 1z/AHU built on the older style block that has a central relief galley and one that sits to the left on the front of the head as well. The valve cover on the 1z/AHU mounts similar to the AAZ cover (3 stud mount) whereas the ALH cover is all cast aluminum and mounts with several studs
Lets see...what else... well, 1z/AHU motors use a slightly different configuration for the injection pump.... a 7 pin pump vs. a 8pin (correct me if I'm wrong) on ALH pumps. Also, 1z/AHU motors use the traditional sprocket drive for the injection pump with a fixed sprocket . The ALH introduced the use of a pressed on hub to the pump and an adjustable sprocket that bolt to this up that allows for initial timing adjustments to be made WITHOUT having to take the pump loose at the front flange and back retaining bolt (like you do have to do on old IDI motors as well...)
The 1z/AHU was rated with 90hp and 150ft/lbs...the ALH 90hp and 155ft/lbs
1z/AHU used a wastegated Garrett turbo that was fairly small and with the ALH the movement was made to the use of the VNT 15.
As far as performance. Flat out...there is more programming options, etc. for the ALH just off the shelf...
(Reason for the thought process--there seems to be a dearth of older Passat/Jettas around to find a likely conversion engine, but I have found a decent 1998 Beetle within striking distance (which I understand does not have the immo...))
Found this thread here that seems contradictory on the motor mount bosses? This thread eems to conclude that either would do for a Vanagon conversion depending on availability. The 'internal' waterpump on the ALH does seem a little annoying though...
http://forums.tdiclub.com/showthread.php?t=262343
Last edited: