2.1 20v ABF/AEB

Hi guys

Need some advice please

Going to build a 2.1 20v n/a engine i have a list allready

ABF block (got)
AEB head
Diesel 95.5mm Crank (got)
TWM 48mm thottle bodies (got)
Throttle linkages (got)
Injectors (got)
Custom timing belt (got)
Custom made piston 84mm
CAT cams/ Kent cams/ Piper cams?
ECU loom (got)
Sensors (got)

The question, what compression should i go for was thinking of 12.1/13.1 comp, also which cams to match


Nas

 

the 50,000 dollar question. It'll depend on your cam choice.

 

Thats another thing i'm not sure which cams do i go for?

Nas

 

Is this for the Rallye? Or is that staying turbo'd?

 

Alex

Long time no hear mate

No Rallye still being turbo'd mate (should be picking it up soon)
2.1 20v N/A is for a mate he's had 1.9 16v on 45 delloto's, time for a change


Nas

 

If you're going to put it on 48s, that points to a heavy breather and some big cams, so you steer off that.

On that basis, 12/13:1.

Check budget in place and proceed!

 

He has a budget for custom spec pistons and cams but he's not too sure what is the best way, also the car will only be a weekend track car


Nas

 

Stick some 300-ish degree cams in it, with 13mm lift, on that compression.

Cat/Schrick - that's the sort of thing he will need to drive it.

 

Are you not just better sourcing the later 06X block with the correct head gasket surfaces to match the 20v head? Sounds similar to Boffs spec of engine and I think he used the ALH block. No intermediate shaft on the later block too.
The 20v head has extra oil drains that need blocked off and a couple of other issues if fitted to an 058 block IIRC.
Check out vortex 20 / 20 or INAs section on here as this may clarify a couple of points.

 

Ah, 20v head subtlety missed.

Scrap those lift mms, but budget for some robust SuperTech valves - talk to the Badger.

Boffs block started out as a 16V one and was later changed IIRC, but I forget what to.

 

Phew, had me worried there for a moment. Saw yours a few weeks ago, when the engine was in. Love the shifter!

 

Paul's (boff) has always been an iron block, is'nt ALH an alloy block Passat/A6?

Check the block you use will take that bore BEFORE you order pistons!

You will also need a custom head gasket at that size which will be VERY thin on the fire ring.

An 83mm bore would be a much safer bet, 83.5 may go but needs to be checked 100%.

Big bores are not worth a tug if reliability is compromised... in fact, they're not worth a huge amount in power at all, certainly the difference between 83 & 84mm considering the possible grief.

Custom JE pistons would do the job either way.

C.R, as said need to match the cams... Pauls are 304 inlet (the inportant bit to get right regarding c.r) so on somthing like that 12-12.5:1... all subject to some calculation but in that ballpark.

The above with the right bits and but together/set up correctly should get you in the ballpark of 240hp.

 

If you speak to CAT Cams they will design the cams to your specific engine spec and compression.

If you are stroking the engine to get the capacity speak to Integrated engineering they do Stroker kits for the 20v block to ake it upto 2.1L Capacity but specify high compression and they will order some spec pistons.

http://www.intengineering.com/VW/18T/Stroker-Kits/18t-20v-21L-Stroker-Kit-p7669691-1-2.html

 

It's been long time coming can't wait to pick the Rallye up mate

Nas

 

Decided to go for 83.5mm on the ABF block
The reason why we choose the ABF block and 95.5mm diesel crank was due to the rod/ratio anlge
Comp will be 12.5:1 with custom J/E or wiseco pistons
Cams i suppose i'll ask the engine builder?

 

Good call...

Take a look in the Kent Cams listing, 304 inlet 296 exhaust (I think from memory)

 

The 95.5MM Crank will need machining so it doesn't catch the Oil injectors on the block

i have a 1Y Crank that i was going to fit in a ABF Block and found the clearance issue.

Also the botton on the ABF Bores will require a fettle to accept the H-Beam rods of the stroker crank. i had to do this with my 92.8mm Eurospec crank.

 

Nice info there Brookster mate.
The plan is to use standard rods lightend/balanced/shot peened
With custom made pistons

Now do i have to tell the engine builder the above or will he know, sorry for the daft questions guys


Nas

 

Some thing like this?

Application Power Band Cam Lift(mm) Valve Lift(mm) Duration Timing Full Lift VC (mm) LTDC Required Parts
Supersport 3000-7500 I 9.75 E 11.27 I 9.50 E 11.02 I 308 Deg E 297 Deg 48/80 75/42 I 106 Deg E 106 Deg I 0.25 E 0.25 I 2.69mm E 3.10mm N/A

Is that cam going to be a bit lumpy?


Nas

 

He will figure it out himself but i would mention it to him.

Also i would use H-Beam rods for the extra 220 from inteng

my mates 16v snapped a standard rod and destroyed the block at 8k rpm