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actual differences between f4r blocks (700 series vs 800)

pepinosport

New Member
Hiya,
my 225 F1 team needs an engine, it basically spun a bearing and I'd like to buy a used engine instead of rebuilding this one.
My question is about a F4R I found with index 802. These 800, 802 engines were mated to pk4 gearboxes in the Laguna 3.
The high output turbo 700 series (774 megane rs and 784 Laguna 2 gt came with nd0 gearboxes if my memory serves well.
I know all these engines share identical internals and heads but, it seems that the 800 series have slightly different blocks to accommodate the pk4's as I've noticed a different part number in dialogys. I already know that clutch and flywheel will be different and I will need to use my 774 flywheel but, does anyone know if there's any other change that might interfere with the engine being fitted in the 225?
Visually to me they're identical except for a plugged hole on the right of the crankshaft pulley (towards the front) that in the 700 series is open.
Thanks!
 
Solution
Hi, I've been busy but I wanted to give my feedback:

776 and 786 are the same engine. 800 and 802, have the same block, internals, head, head gasket and turbo.
The intake manifold is slightly different, as well as the oil breather lines. To me it looks similar to those of mk3 mrs.
The dipstick tube is different due to the slightly different intake manifold.
The flywheel and clutch are pk units, so you need nd box clutch/flywheel assembly.

TLDR: 800 series is a pretty straightforward swap, and usually cheaper than actual megane engines.
Hi, I've been busy but I wanted to give my feedback:

776 and 786 are the same engine. 800 and 802, have the same block, internals, head, head gasket and turbo.
The intake manifold is slightly different, as well as the oil breather lines. To me it looks similar to those of mk3 mrs.
The dipstick tube is different due to the slightly different intake manifold.
The flywheel and clutch are pk units, so you need nd box clutch/flywheel assembly.

TLDR: 800 series is a pretty straightforward swap, and usually cheaper than actual megane engines.
 
Solution
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