Toyota 4Y pistons in a Nord motor - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 7 (permalink) Old 04-01-2017, 04:28 PM Thread Starter
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Toyota 4Y pistons in a Nord motor

I have been reading some threads and came across this concept of using Toyota 4Y pistons in a Nord motor. Apparently this conversion increases capacity to around 2.2 liters.

Has anyone actually done this conversion or have any more info on it? I have not come across something giving an in depth explanation.
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post #2 of 7 (permalink) Old 04-01-2017, 05:19 PM
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The compression ratio would be very low. Would have to be turbo or super charged as I assume the Toyota piston is close to a flat top piston.

Pete

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post #3 of 7 (permalink) Old 04-01-2017, 05:28 PM
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The only ways to increase engine capacity is via a larger bore and/or a longer stroke. Simply changing pistons does not change the "size" of the engine.

If one wants to increase the bore for more cc's, the limit is reached quickly due to the thin insertion neck of the wet sleeves.

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post #4 of 7 (permalink) Old 04-01-2017, 06:25 PM
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As Don points out, pistons won't change the displacement. Nor will rods and pistons together.

2 liter is pretty big for a Nord motor anyhow. The block was originally designed for smaller displacements.

Chris

1990 Spider Veloce
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post #5 of 7 (permalink) Old 04-20-2017, 09:12 AM
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When the 1750 grew to 2000, Alfa shifted the bore centers. Also, the block got progressively taller. So 1300 and 2000 are not exactly interchangeable, though yes, the same basic architecture.
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post #6 of 7 (permalink) Old 04-20-2017, 09:41 AM
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Quote:
Originally Posted by burgs1995 View Post
I have been reading some threads and came across this concept of using Toyota 4Y pistons in a Nord motor. Apparently this conversion increases capacity to around 2.2 liters.
Can you post a link to the thread that suggested Toyota 4Y pistons in a Nord motor as a means to increase capacity to around 2.2 liters? I certainly agree with the explanations given in the posts above, but am curious what the original post said about this swap (not that I am considering doing it).

Jay Mackro
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post #7 of 7 (permalink) Old 04-21-2017, 01:17 AM
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Originally Posted by Alfajay View Post
Can you post a link to the thread that suggested Toyota 4Y pistons in a Nord motor as a means to increase capacity to around 2.2 liters? I certainly agree with the explanations given in the posts above, but am curious what the original post said about this swap (not that I am considering doing it).
was a brief mention in the SA forum in UK in 2009, but when asked for details on the 4Y piston thing, there was no answer.

Nord mods unique to SA - Alfa Romeo Forum

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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