Little makeover for the '79

[16v_kid]

The old bunny has been tired lately....so time to do something!
Building a 1.9 8v engine for her(82.5 piston,custom Pauter rods) along with a few other goodies.
Will be running oversize brake/calipers on her, braided lines etc..
Currently running KW v3 coilovers.
Watch this space...

[WABIT]

why does the box say 1.8lt when your building a 1.9?



dom

[16v_kid]

why does the box say 1.8lt when your building a 1.9?


dom

Because its 1.8 rods just longer (custom) to 1.9. The lenght is increased from std 1.8 rods, if im making sence.

[WABIT]

yeah i know why and how to stroke a motor... was just asking why they would put 1.8lt on longer 1.9 rods

dom

[16v_kid]

Wouldn't know man. Maybe to indicate that there custom or something, instead of people thinking there of the shelf.

[16v_kid]

Okay....

Engine and gearbox out, we weren't sure if it was a Heron so when we had a look we were quite surprised.






Cao.

[Oneofthegreats]

Nice dude. Glad to see you & your dad doing some upgrades to get this thing going.

The Part # appears to be a Pauter Rod number! Way overkill on this type of engine, but if your happy to spend the money. Go for it.

Just for interest sake. A bloke down here who use to build F2's engines said they use to spin there 1.6L to 10K on stock rods & they are very strong, even for forced induction too.

One thing I'm not too sure on though, is you've got a 1.6L but fitting 1.8L rods? This doesn't actually increase the capacity though, cause your crank stroke/offset is still the same.

All that fitting a 1.8L 144mm rod onto the stock 1.6L crank will do is move the piston out of the block!


To increase capacity, you need to offset grind your crank journals to increase the offset & stroke & using the stock 136mm rod you'll also need custom pistons with different piston pin heights to compensate for the increased stroke.



Many many moons ago Autotech did a 1.9L stroker kit using a US spec 1.7L crank, 136mm rods & with a 83mm Techtonics Tuning custom piston brought the capacity to 1869cc

So maybe just ask some questions why or what your using those rods for, unless your fitting a 1.8L crank to? Not sure if these fit in 1.6L blocks either


I have also read that some people used to run a offset ground 1.8L crank & using the earlier 136mm rod & custom/decked pistons, they can stroke the 1.8L too!

I do know on some stroker kits though, that the intermediate shaft may need some machining/clearancing

[16v_kid]

Thanks Tim!

We are using a 1.8 block( bored out and balanced bottom end), with a 1.8 crank and 84.2mm pistons. And yes, they are Pautor rods

Interesting facts there but.

I should of mentioned it, but a 1.8 block is getting prepared on the side ready to pop in the mk1. The 1.6 will just be put aside.

[Oneofthegreats]

Thanks Tim!

We are using a 1.8 block, with a 1.8 crank and 84.2mm pistons. And yes, they are Pautor rods

Interesting facts there but.

Ah ok.

So your not using the Heron head then? Unless you buy some very specific heron head style pistons or have them custom made

Just remember & I think we've been through this before. You can't go to 84.5mm pistons.

3.5mm overbore from what I know can't be done! Thats a 0.137 Thou Overbore & will probably end up in the water jackets!

From what I know & can find 83mm (83.5mm is the largest for a 2L block & very rare for a 1.8L block) piston are the largest piston you can buy for a 1.8L block & even then it isn't advisable for a track engine as this also causes cooling problem under extensive high load/pressure

[16v_kid]

Ah ok.

So your not using the Heron head then? Unless you buy some very specific heron head style pistons or have them custom made

Just remember & I think we've been through this before. You can't go to 84.5mm pistons.

3.5mm overbore from what I know can't be done! Thats a 0.137 Thou Overbore & will probably end up in the water jackets!

From what I know & can find 83mm (83.5mm is the largest for a 2L block & very rare for a 1.8L block) piston are the largest piston you can buy for a 1.8L block & even then it isn't advisable for a track engine as this also causes cooling problem under extensive high load/pressure

opps typo I meant 82mm. There just stock 2L pistons.

nah not using the Heron head. Would these engines be rare by any chance?

[jayjay]

can't be done says tim. weld up the water jacket? hehe

good to see some loving going in to a cool coloured mk1.

are you going to run the 8v on k-jet?

[16v_kid]

can't be done says tim. weld up the water jacket? hehe

good to see some loving going in to a cool coloured mk1.

are you going to run the 8v on k-jet?

opps typo I meant 82mm. There just stock 2L pistons.

nah not using the Heron head. Would these engines be rare by any chance?

Yeah, running k-jet system on the 8v.

[Oneofthegreats]

opps typo I meant 82mm. There just stock 2L pistons.

nah not using the Heron head. Would these engines be rare by any chance?

Only if you've got a hard on facination with 1.6L Herons.

I don't. Prefer going for larger displacement anyday.


Afterall.

There is no replacement for displacement.

Even if it is only 1.8L! whoooooooooo.


82.5mm is stock 2L pistons.

You'd also want to double check the Piston Pin heights too! As the 2L had longer Rods!

This may put the pistons down the bore (with increased deck height/more clearance volume = less compression!) if you plan on using a 1.8L crank & 144mm rods

[Oneofthegreats]

can't be done says tim. weld up the water jacket? hehe

I wish it was that easy. But its not.

Even if you grout filled the block it wouldn't cope with an overbore that much!

The 83.5mm overbore is still 0.098" Thou & is very much on/over the ragged edge!

The max I've always been taught is 0.060" max over bore on nearly every motor.

But VW bore linings must be thick, as a 83mm bore (0.079" over bore) is run of the mill stuff.


Once you go through the lining, welding, grout filling, or even pissing in it won't make any difference.

A cyl. lining is a lining. Once its gone. Thats the end of it, if its part of the block. (unless you re-sleeve it, or come up with some hair brained idea to convert a 85+mm removable iron lining out of another manufacturers block!) haha

[16v_kid]

can't be done says tim. weld up the water jacket? hehe

good to see some loving going in to a cool coloured mk1.

are you going to run the 8v on k-jet?

opps typo I meant 82mm. There just stock 2L pistons.

nah not using the Heron head. Would these engines be rare by any chance?

Only if you've got a hard on facination with 1.6L Herons.

I don't. Prefer going for larger displacement anyday.


Afterall.

There is no replacement for displacement.

Even if it is only 1.8L! whoooooooooo.


82.5mm is stock 2L pistons.

You'd also want to double check the Piston Pin heights too! As the 2L had longer Rods!

This may put the pistons down the bore (with increased deck height/more clearance volume = less compression!) if you plan on using a 1.8L crank & 144mm rods

Its all checked Tim. We dummy fitted to rods and pistons and on TDC, the pistons his goes just over the block deck. We still need to measure the TDC, but we will do that when we get more progress done in the engine.

Were not using 144mm rods, our rods are longer then 144mm but shorter then 159mm.