Diffences between the G13A and G13B blocks

[Santos]

Hey what are the differences between the g13 a and g13ba blocks?







I tell ya

The clean one is a swift g13ba and the dirty a sierra g13a

Red squares indicate extra reinforcing and mounting holes



Red squares indicate extra reinforcing and mounting holes


The single red square for gearbox or somenthing


i could not spot any major differences


Finally the top, almost identicle except a bump at the rear on the g13b
(you can also see it at the top of the block on rear shot)

I pulled both engines apart nearly 2 years ago and they do look the same particulary when you do it one at a time and the sierra block being so dirty

it wasnt till i had them side by side cause i was planing on listing them on ebay for $15 each that i really saw the number of changes in the g13b

gut feel would of made me say the g13a was a better block but thats just because its in really good condition despite all the elements it has faced. if i can remember to buy a button battery for my digitals scales and find the end caps for the g13b and weigh them.

the other difference between swift and sierra blocks is the rods, the sierra has thick gti-like rods with the 17mm pin and the swift has thinner rods (about 1.5mm-2mmm from memory i dont have the swift rods anymore)

any other request for me to check on the blocks let me know before i clear them.

[scooby_74]

for a sierra there is no difference just mounting points on a B block which is used for a SF type swift otherwise all the same in the engine block.
Difference between an A abd B engine is the crankshaft and piston pin hight.
The A pistons are less likley to get piston slap and dont tend to break piston skirts as much but are higher compression and need to be run 1 or 2 degreese less in timming.
You can use an A type block for a gti engine or bb jimney engine if you want so long as you dont want to bolt it into an 89 to 96 swift as the extra bolts holes on the inlet side of the block are needed for mounting but sierra doesent make any difference

[Santos]

still if you are building from scratch the g13b stamped blocks are the better ones to start with, all that structal reinforcing probably came about to keep the block rigid under higher strains

some of those bolt holes look like acc options like P/s and a/c

i actually been pondering how i might put the rear bolt holes to use

[Santos]

Hey what are the differences between the g13 a and g13ba blocks?

Red squares indicate extra reinforcing and mounting holes

forgot to add, the bolt hole up the top on the g13b/ba near for fitting a knock sensor