Hot 1200, er well 1470 actually!

6832 Views 59 Replies 13 Participants Last post by jasengine, 11 d ago

jasengine

Discussion Starter · Jun 15, 2017

Completed my hot 1200 although its now 1470cc = 64mm original crank with 85.5 pistons etc...

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jasengine

Discussion Starter · #2 · Jun 15, 2017

Edit:

Spec is:
64mm crank, dynamically balanced with flywheel, clutch & pulley,
85.5mm piston/Cylinders, shortened to 1200 cylinder length. Pistons clearanced for short stroke.
C25 cam with HD single springs & lifters,
9:1 static compression,
Power pulley,
26mm oil pump & full flow cover,
Deep sump,
External oil filter
Ported 1600 twin port heads
Std. 1:1 Rockers (will update to 1:4 one day
Twin DRLA40 carbs
Doghouse fan and oil cooler
Std. SVA Distributor for now.

Its been run in on my test stand, just need to set carbs up properly.

Lot of work for probably not much HP, but it will be fun and its been a good leaning experience :lol:

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GARRICK.CLARK+

· #3 · Jun 15, 2017

I like it . Well done.

at_afonso

· #4 · Jun 16, 2017

Very nice and different😉
Curious to see the performance🤔
Abel

jasengine

Discussion Starter · #5 · Jun 16, 2017 (Edited)

Thanks for the complements. Its been a long road to get to this point :lol:, time and money being the restrictions.
I can't wait to see how it performs, I will hopefully get it tuned properly on a rolling road too

There's just all the other stuff to do, as the bug has been off the road for six years. Im installing all the additional relays and wiring for the gauges, external oil cooler fan & thermostat, etc etc at the moment.

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jasengine

Discussion Starter · #6 · Jun 16, 2017

Test stand:

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64-67luke

· #7 · Jun 25, 2017

What did you do with the con rods? As the 1200 and 1300-1600 are just a little different?!?!
1200 rods and much work on the little end?

Cheers
Luke

Forsh

· #8 · Jun 26, 2017

I agree! well done for not being a sheep and being individual just like Hot1200 :crazy:

You must reap the rewards and finish the build with a dyno set-up would be a shame and a waste otherwise

I notice a little bodywork going on in the background, do the rear quarters correspond to the "Sweeny Line" principal?

jasengine

Discussion Starter · #9 · Jun 27, 2017

64-67luke said:
What did you do with the con rods? As the 1200 and 1300-1600 are just a little different?!?!
1200 rods and much work on the little end?

Cheers
Luke

Ahh haa, yes there was some jiggery pokery with the con-rods.
It still has the standard 1200 64mm crank. The con-rods, I pressed out the little end bearings and bored out the small end to fit the larger bearing, so it would fit the 85.5mm piston's gugon pin

The big end cap bolts I replaced with ARP bolts, then weighed each rod and got them within 0.1g (??!) of each other. The piston skirts I had to mill down to clear the case (due to the short stroke). I then got them within 0.1g or so of each other.

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jasengine

Discussion Starter · #10 · Jun 27, 2017

Forsh said:
I agree! well done for not being a sheep and being individual just like Hot1200 :crazy:

You must reap the rewards and finish the build with a dyno set-up would be a shame and a waste otherwise

I notice a little bodywork going on in the background, do the rear quarters correspond to the "Sweeny Line" principal?

This is one of the reasons why I wanted to do it: Not because it would get the most power for the money, but more because I could. I got loads of questions on thesamba forum, of 'why dont you stick a 69mm crank in it'? etc etc. Too easy, everyone has done it etc.
I will get it on a rolling road dyno with out a doubt

The bug is almost finished: I've installed the CSP vented disc brake conversion up front with sway-away adjustable beam. Rear will be lowered a bit with adjustable spring plates.
Not quite sure what you mean about the 'Sweeny Line' principle :lol: I've just slapped some filler onto the new repair panel, but got no further with it, I get distracted with the mechanical bits

Reactions: 1

jasengine

Discussion Starter · #11 · Jun 27, 2017

3

Here's some of the machining work I did:

1200 cylinder on right, shortened 85.5mm (1600) on left:

CSP big disc brake conversion:

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Forsh

· #12 · Jun 27, 2017

Cool! - Proper workshop!

Do you have a build thread?

Sweeney line...

Andy Sweeney (user name Last Triumph), his name has become synonymous with the "Sweeney Line"

http://www.volkszone.com/VZi/showthread.php?t=1405801

jasengine

Discussion Starter · #13 · Jun 27, 2017

No build thread. Maybe I would if I had time.

Ahh now I know what a sweeney line is :lol:

I think mine is almost straight........

jasengine

Discussion Starter · #14 · Jun 29, 2017

Forsh said:
Cool! - Proper workshop!

Do you have a build thread?

http://www.volkszone.com/VZi/showthread.php?t=1405801

Actually, yes I do :lol:

https://www.thesamba.com/vw/forum/viewtopic.php?t=573067

jasengine

Discussion Starter · #15 · Jul 12, 2021

4 years later........

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jasengine

Discussion Starter · #16 · Jul 12, 2021

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jasengine

Discussion Starter · #17 · Jul 23, 2021

There is not much room with all the extra pipework and oilcooler/fan: Adjusting the clutch cable was tedious!

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jasengine

Discussion Starter · #18 · Jul 23, 2021

I made blanking plugs from acetal (POM) plastic. They're held in with grub screws clamping onto the inside face of the pipe sub.

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jasengine

Discussion Starter · #19 · Jul 23, 2021

This is the oil breather tank I was going to use, which I bought some years ago and only got round to fitting it last year! It's too big! There was not enough clearance at the back between the doghouse cooler and fire wall for my setup. Pity, as its a stainless steel one from CSP (If anyone is interested, I'm open to offers...).

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brewsy

· #20 · Jul 24, 2021

NICE.
I love these 'little' builds and people using the 64mm stroke.
Whilst everybody says that the stock 64mm cranks are Mr Whippy and twist etc I reckon that will be a rev monster and you'll have trouble not putting your foot in it!!!

Video PLEASE as soon as you get it sorted

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