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 Post subject: do i need valve reliefs?
PostPosted: Thu Jun 15, 2017 5:53 am 

Joined: Thu Jun 15, 2017 5:46 am
Posts: 4

This is my first post so may I introduce myself first!

I'm German, lived in BC Canada for some years and now traveling in Mexico since 18 month.
I had old cars my whole life and worked on them myself.
My newest project is an 1960 MGA Coupe rally race car in Mexico for La Carrera Panamericana! I raced it last year with an original Datsun 1800 J-engine.
This year I am swapping an L20B in it! For the rules I have to stay under 2liter with 8 valves, carburated and wet sump!

So I have read a lot about the L20B and my options of making a decend Rally engine out of it!
I bought 2 engines and 2 5-speed transmissions and an W53 peanut head.
I determented an 150mm forged H-beam rod that fits and will eather get custom forged pistons made or use forged pistons from an Mitsubishi with 86mm and 10.5 to 10.75:1 c\r.

I have many questions about tuning the L20B and the first one is:
From witch cam lift on do I need valve reliefs (pockets) in an 0 deck flat top piston with the W53 head??? Any experiance with this combo?
(I actually might end up 0.2mm above deck hight - depends on the cc's of the pockets)
Can not mesure it myself rightnow because the head is not in my hand yet ;)

Thank you guys!

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