L20 connection rods

[Blobber]

I'm looking for connecting rods for my L28 project. Rods which I'm looking for are L20A. Also any info where could I find these are appreciated. Contact me to my e-mail make114 @ gmail.com

[nat0_240_chevZ]

i rember talking to some dill @ city dismantlers saying he had a complet l20a turbo!!, or 2 or 2 l20 & 1 l28t?

cant recall but was a while ago now.

No the 4cyl l20b rods are not the ones you are looking for or  are after incase anyone chimes in with ye ol i gotta 200b you can HAVE!!! lol

[Blobber]

Yes that's right, I'm looking for 6cyl rods. I'll send e-mail to city distmantlers and ask from them if they have those.

[NZeder]

also you want pre 79 L20a rods as the later and L20ET rods are not the 133mm long units like the L24/L16 but are 135mm and have a smaller journal and pin. Early units share the same journal as the L24/26/28 and LD28 but the later 135mm long units have a 49mm journal not the 51mm and the pin is 19mm not 21mm. Not sure about the rod thickness if there is any difference there either but if they are the same I guess you could just have the engine builder machine down the journal on the crank to take the smaller journal rods from the later L20aE and L20ET units.

 

Just a heads up on the difference between the pre 79 L20a and post 79 L20a rods - confused you soon will be.

[Blobber]

the ones, which I'm looking for are 128mm long. I think they are from L20A.

 

What are the difference between pre L20a and post l20a rods?

[NZeder]

Never head of 128mm rods for a L series ever. The L20a have 133mm and 135mm with the 133mm the pre 79 and the 135mm post 79. The shorted rods I know of for a L series are the L26/L28 at 130.3mm I won't go into the longest as I don't know if the Z Series engines (4 cylinder based on the L4 block with the cross flow head) work or not.

 

If you are basing the 128mm rod length on the engine design on Ozdat then the info is incorrect (notice how the block height is missing). The L20a rods that I have found here in NZ have been either the 133mm or the 135mm rods.

 

The standard specs for the pre 1979 L20a are as follows.

Block height = 207.85mm

Stroke = 69.7mm

Bore = 78mm

Rod = 133mm

Piston Pin Height = 40.1mm

 

So that makes a deck height of -0.1mm or the same as the L24

 

The post 1979 L20a have the following specs

Block height = 207.85mm

Stroke = 69.7mm

Bore = 78mm

Rod = 135mm

Piston Pin height = 38.1mm

 

Again the same deck height.

 

I hope this info helps.

 

See here for some info too.

http://www.kameariengineworks.co.jp/catalogue-P7..pdf

[Blobber]

Never head of 128mm rods for a L series ever. The L20a have 133mm and 135mm with the 133mm the pre 79 and the 135mm post 79. The shorted rods I know of for a L series are the L26/L28 at 130.3mm I won't go into the longest as I don't know if the Z Series engines (4 cylinder based on the L4 block with the cross flow head) work or not.

 

If you are basing the 128mm rod length on the engine design on Ozdat then the info is incorrect (notice how the block height is missing).

I hope this info helps.

 

I hope this info helps.

 

Well you are correct. I based my information on Ozdat. I knew that there were some mistakes, but I didn't think this could be the one. Now I have to figure some other solution to my problem. Thanks for clearing this mistake out.

[NZeder]

If you really need a 128mm rod here is an idea (I know in Japan they did this - took a post 79 L20a 135mm rod and offset bushed it to bring the length out to 137mm ie same length as the L14 rods - not sure but I can only assume they would have had to do the crank journals also) back the idea.

 

Take a set of L28 rods with a length of 130.3mm and offset bush these to have a centre to centre length of 128mm. My last L30 bottom end using L28 rods and crank (and a 90mm bore) I had the rods bushed to take the RB30 bushing at the little end so there is enough meat to do the job as the RB bush is large vs the stock L28 little end bush (both still have the 21mm pin diameter)

 

So that is one option to consider.