1.8l16v head......?

VWnoob · Post by **VWnoob** » Wed May 25, 2005 5:46 pm

Hey guys, will a 16v head from a 1.8l Scirroco bolt directly onto my block?

Post by **Calimus** » Wed May 25, 2005 11:06 pm

If you have a standard 1.8L 8v block, I believe the answer is no. If I remember correctly, there are some water/oil gallies that are different.

Now if you have a ABA block, I think there is an adapter you can use.

If you have a 2L 16v block, then the 1.8 16v head will bolt right on.

-vertigo- · Post by **-vertigo-** » Thu May 26, 2005 9:36 am

^^^ spot on.

i've been thinking about a NA motor for another project. i'd go with:

2.0 16v block
1.8 16v head
1.8 16v crank

it should end up with a c/r of about 11.1 and displacement of 1.9l. a nice short stroke means it will rev and howl like a Porsche motor

Post by **Calimus** » Thu May 26, 2005 10:27 am

oh, I didn't know the 1.8L crank was usable in the 2L block. I thought the line bore was a bit larger in the 2L block.

Now that I know this can be done, I might have to go that route as well. Thanks for the info Dino!

VWnoob · Post by **VWnoob** » Thu May 26, 2005 10:45 am

Ok, so it cannot be done.

So my best bet is to get the 2.0l ABA and that will give the option in the future to throw on a 16v head if I wanted to.....right?

Oh and wow, Dino, I didnt know that you could mix and match cranks like that. It would seem to me as if the 1.8l piston rods wouldnt line up with the 2.0l cylinders. But hey if it can be done! Good info!

Thanks guys.

Jim

sixsracing · Post by **sixsracing** » Thu May 26, 2005 3:22 pm

Actually, in my opinion your best bet is to find an old Audi 80 2.0L motor. Then you won't need to change the front pipe to adjust for the ABA motor being to tall.

Post by **Calimus** » Thu May 26, 2005 5:40 pm

Thats very true, the ABA is a tall ass block. What was the block the dubbed the "bubble" block, I don't remember.

VWnoob · Post by **VWnoob** » Thu May 26, 2005 6:53 pm

Really?! An Audi 80 engine? I have never heard of that. Is it an easy swap?

-vertigo- · Post by **-vertigo-** » Thu May 26, 2005 8:56 pm

i haven't fully built the mix-and-match 16v yet, but my friend and i think it's going to work. we played with a few parts laying around his shop, but i still wouldn't be suprised if something blew up

hehe

it's true the 3A audi block is shorter and that means no downpipe issues, and both 2.0 block produce about the same peak gains, but in my experience the ABA is a superior design.

i'm pretty sure the ABA has a slightly better torque curve, but really the reason i prefer it is the silky smooth operation. the 1.8 and the 3A are really rough by comparison. i'd take the hassle of the 16mm height increase in return for a refined motor.

sixsracing · Post by **sixsracing** » Fri May 27, 2005 10:02 am

What's the difference in the motors I wonder. The one thing that comes to mind is the balance shaft. I wonder if a 2.0L ABA balance shaft can be swapped into a 1.8L. Hmmmmm......

-vertigo- · Post by **-vertigo-** » Fri May 27, 2005 10:15 am

Tag Bore Stroke Disp Jrnal Lgth Wrist C.Hight Dish B.Hight C/R
1.8 81.0 86.4 1781 48 144 20 32.2 10 220 10:1
3A 82.5 92.8 1984 48 144 20 ? 15.5? 220 10.5:1
ABA 82.5 92.8 1984 48 159 21 30.9 14.61 236? 10:1

That 1.8 is the updated 2H version. The 3A and ABA are close in spec, really only the rod length is different. The refinement must come from something not in these specs, I think.

dubchickshubby · Post by **dubchickshubby** » Sat May 28, 2005 10:22 pm

Now I'm wondering, would there be an advantage to yanking the balance shaft? What's wrong with a little vibration?
I've had a few Mitsu 2.6/4's in the past, and one of the forst things ya did to them puppies was to put the Melling kit in it to drop 40 lbs. of drag and weight!

I'l be re-doing the 1.8 8v out of the 82 Rocco for the wife's cabby and of course all kinds of things cross your mind when you've got an extra mill laying around...

sixsracing · Post by **sixsracing** » Tue May 31, 2005 8:03 am

Eliminating the balance shaft in a VW is a little more difficult than in a Mitsubishi. The VW drives the oil pump and the distributor with it.

Post by **Calimus** » Tue May 31, 2005 10:18 am

maybe in an 8v it does. Just drives the oil pump in the 16v. Still a kinda needed thing though. No oil, no go far.

sixsracing · Post by **sixsracing** » Tue May 31, 2005 5:03 pm

Sorry, should have made that a little more specific. Yes, the 16v distributor runs off the camshaft, the 8v off the balance shaft, and the diesel just runs.