engine swaps - 4500, 4900, 4100 engines

[Stealth]

engine swaps - 4500, 4900, 4100 engines

calling in anyone that knows, or had done it or has even attempted it ..

regardless of car model, are the 4500, 4900, 4100 engines

interchangeable?

do the transmissions bolt on between the various

engines?

are the engine mounts on the blocks interchangeable?

will the EMISSIONS packages run into trouble?

[Ed Hall]

calling in anyone that knows, or had done it or has even attempted it ..

Yes, it has been done sucessfully. You can go from a transverse 4100 to a 4500, transverse 4100 to 4900, or a 4500 to 4900. The larger engine will need more fuel so an adjustable FPR can be used.

regardless of car model, are the 4500, 4900, 4100 engines

interchangeable?

Yes, as long as they are transverse mounted engines. Some of the 4100's were for RWD applications and that same block was mounted longitudinally in the 83-85 Eldorado/Seville so these are not interchangeable.

do the transmissions bolt on between the various

engines?

Same answer as the last one.

Hope this helps. Are you planning on installing a larger engine in your car?

[Stealth]

Ed,

there has been some activity and interest in considering the 4100 equipped Allante for

installation of either the 4500 or the 4900.

we have an issue of failing solenoids on the trani of the 4500 that are only available from

Allante donors, people are even buying a car to remove one trani part and part the rest of

the car . we have another issue in the 4100 Allantes, want more hp.

N* upgrades seem out of the question as nothing seems to fit into the early Allante frames

according to the few that tried it, plus there are numerous things that GM took out of the '93

models that many of us would like to keep.

it may be that the most important question after the physical fit is the emissions

and smog tests in states like California

it would be great if a clean swap could be done without touching the harness and its connections

to the numerous black boxes the early '87 to '92 cars use to operate. the Allante crowd stands

by "cant be done."

what do you, Non-Allante guys, think?

calling in anyone that knows, or had done it or has even attempted it ..

Yes, it has been done sucessfully. You can go from a transverse 4100 to a 4500, transverse 4100 to 4900, or a 4500 to 4900. The larger engine will need more fuel so an adjustable FPR can be used.

regardless of car model, are the 4500, 4900, 4100 engines

interchangeable?

Yes, as long as they are transverse mounted engines. Some of the 4100's were for RWD applications and that same block was mounted longitudinally in the 83-85 Eldorado/Seville so these are not interchangeable.

do the transmissions bolt on between the various

engines?

Same answer as the last one.

Hope this helps. Are you planning on installing a larger engine in your car?

.

[Ed Hall]

"it would be great if a clean swap could be done without touching the harness and its connections

to the numerous black boxes the early '87 to '92 cars use to operate. the Allante crowd stands

by "cant be done."

what do you, Non-Allante guys, think?"

_________________________________________________________________________

I don't see any reason why it can't be done. Go for it. The engine block for the FWD 4100, 4500 and 4900 is basically the same. The 4500 had the the same stroke as the 4100 but larger bore and the 4900 had the same bore as the 4500 but longer stroke. For the Allante, I would install a 4900 block and would install the heads, intake manifold, throttle body and all the electronics from the Allante. If you want the extra power that the 4900 could put out, you would need to supply it with more fuel than what the Allante port injection is programed for so an adjustable FPR could be used or a piggyback system such as megasquirt could be used.. From what I understand, it is legal to install a newer engine into an older car so it should pass California smog inspection.

Go for it!! Be the first to have a 4900 powered Allante.