MG-A with Datsun 1800 needs to get FAST!

Engine, Transmission and related drivetrain.
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sneax
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby sneax » 21 Apr 2017 10:02

OK
sorry for my unpatience... :mrgreen: I split my questions:

How high is the L20B from oil pan to top of the headcover?
How high is the L20B from the bottom of the bellhousing to the top of the headcover?
how low race oil pans exiting? like this ones:
Image
Image

Thank you guys
:D

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sneax
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby sneax » 15 May 2017 19:50

Update

After searching measuring and calculating.... I decided to go for it!

I will put an L20B in the MGA for this years Carrera Panamericane!
I found already two Engine and bought them. One ha a W58 and the other a U67 head.

The plan is to use one engine highly modified and have one engine in spare.
after reading a lot here and in other forums I think I will go for a "long rod" engine... but have to stay under 2000cc.

I am thinking of 6in z20e rods with 86mm short and light pistons, maybe z20e +1mm.
compression rate should be 10.5 to 10.8. that the highest I wanna go with the Mexican fuel + Octane booster.
lightend and ballanced l20b crank, 2x 45 weber, header, light flywheel, race clutch, sidepipe for more groundclearance.


Any ideas for the pistons?
what ignition would you recommend? is there a Mallory 6AL?
original water and oil pump? ...or are there high flow ones?
are there small and light starter?
witch head is the better one for power and torque?

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sneax
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby sneax » 14 Jun 2017 11:35

Ok - I give it another try for some L20B Information...

I did quite some research, bought an W53 head, determend 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.

From witch cam lift on do I need valve reliefs (pockets) in an 0 deck flat top piston with the W53 head???
(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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two_68_510s
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby two_68_510s » 14 Jun 2017 13:30

Hello Sneax, I am watching this build with great interest, unfortunately I don't have the technical knowledge you need. There are some here who build engines, maybe they would have the answers.
Joel

2 '68 510 2 door sedans
'95 240SX
74 Jensen Healey

“We will either find a way, or make one.” – Hannibal

510rob
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby 510rob » 14 Jun 2017 14:08

What connecting rods did you find that will fit an L-series?? (These old L-motors use unusually wide big-end rod bearings).

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sneax
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby sneax » 14 Jun 2017 14:59

@510rob:
the forged H-beam rods I found are available off the shelf for ~270 USD!
They are 150mm long, match in big end diameter and width and have a 23mm small end for a full floating wrist pin.
nice find I think!

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sneax
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Re: MG-A with Datsun 1800 needs to get FAST!

Postby sneax » 14 Jun 2017 15:26

here is the info:

For Isuzu Amigo Rodeo Trooper 4ZE1 2.6L SOHC 4340 EN24 Forged Steel H-Beam Conrod
Engine Application for Isuzu Amigo Rodeo Trooper 4ZE1 2.6L SOHC
This deal includes 4 pieces of brand new H-beam conrods
8 pieces of genuine 3/8 " ARP 2000 bolts
Dimensions info
Center to center length 150mm
Big end diameter 52mm
Small end diameter 23mm
Big end width 26.8mm
Small end width 26.8mm

I found forged pistons as well - have to look them up in my files if anyone is interested...


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