Author Topic: Help... Simtec 56.0/56.1 vs Simtec 56.5  (Read 1427 times)

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Offline Raffles

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Help... Simtec 56.0/56.1 vs Simtec 56.5
« on: April 10, 2018, 07:52:37 AM »

Does anybody know if you can replace an early X20XEV with a late one? As far as I can see, the ones from late 95 onwards use the Simtec 56.5 ECU and the earlier ones use the 56.0/56.1, like the Cavalier.

Aside from this and the dual sump, is there anything else that would make this a pain in the backside? I can see the dipstick got moved and the air injection pipes were different. Anything else?

Would you have to change the ECU and loom etc.?

Thanks in advance.

Offline electric geen

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Re: Help... Simtec 56.0/56.1 vs Simtec 56.5
« Reply #1 on: April 13, 2018, 21:06:28 PM »
If your not swapping engine from same year and type only use the head or block whichever is totaled on your engine. Take photos and compare or a promise to accept a return, keep the existing inlet, exhaust, cam covers, flywheel (if different). I have done a few engine swaps (not calibras) but always swapped the minimum mechanical bits only, either block or head and sold the rest. Never touched the loom. I have also reused cam belts and head bolts, old gaskets with paste (not head gasket, always new) when on a budget i.e. skint (sharp intake of breath).

Crank regrind, re bore and set of pistons/rings and bearing set is not that dear when you consider you have a "brand new" zero mile block if your going to keep it. Set of valves, followers, springs and valve guides gets you a new head if your cams are in good nick (case hardening still there). Always change the oil pump gears on a new parts rebuild, however good they look.

Another engine can be more trouble than the price tag, I have bought one in the past with piston slap, didn't know until that key turning moment.

I am sure other members may have info.