What does an ABA OBDII run (circa 1997)?
ok, I'm seriously confused here
I recently dropped a 96 2.0 engine/tranny/ecu/wiring harness/dash etc etc into my 92 jetta and was thinking about putting a 16v head on it later on. I did a search and came across this but I seem to be just getting a headache. I have access to a full passat 16v head, can anyone tell me what I need to put this on? Will 9a pistons give me a c/r of 9:1+/-? can my current 96 obdII ecu handle this change?
9A pistons will give you a CR of about 9:1 with a stock headgasket. The ABA uses larger wrist pins so you have to get the rods rebushed for the smaller 9A wrist pin.
You'll still need the rest of the conversion parts: int shaft, pump gear, block off plate, intermediate shaft gear, crank gear, distro, etc.
You also need a Passat 16v auto throttle body to get a TPS.
You can run a 16v head off of Motronic, by swapping the 4 window trigger wheel in the distro for the ABA's single window. I'm not sure how that should line up so you should defnitely examine your stock ABA distro and how the trigger wheel lines up at TDC for refrence.
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tried to find this info cant find it so i`ll ask when you run the mkIII accesories with the swap do you machine down the 16v pully or the aba pully and what all is involved in using the obd II system from the aba with the 16v head. also has any one heard of a valve clearence issuse when usin the aba pistons
why do you need to use the 9a oil pump and intermediate shaft? Why can't you leave the bottom end alone?
I am working on an ABA 16vT right now and I am going to go pick up a 1994 ABA motor tomorrow. I have a 1.8L 16vhead that I am going to put on it. Why should I change the oil pump?
You will have to forgive my ignorance, but I have been looking in the archives and haven't found an answer to my question. What CR do you get when you use an 95.5 crank, in an ABA block, with ABA rods, & 9A pistons? I would like to turbo the set up. Or do I need to use the 9A rods? Is a ABA piston taller from wrist pin to top than the 9A? Sorry is these sound like silly questions, but the help would be appreciated. Thanks.
ok, reasons to change the intermediate shaft are because the timing gear is wider and the ABA intermediate shaft doesn't fit the 16v intermediate shaft gear. The 16v intermedaiate shaft, from a 9A, fits right in and uses the correct width timing gear. Truth be told you can use the ABA oil pump with the 9A intermediate shaft, but the distributor is in the head on the 16v so having 2 distributors is unnnesesary. Therefore the 9A oil pump, drive gear and distributor hole plug are used.
If you wanted to go the other way to use the block distributor and block off the distributor on the head, you could get a block off plate from eurospeed.ca, the put the 9A intermediate shaft in the block and bolt a 16v cam gear in place of the intermediate gear, then leave your ABA oil pump and distributor, but then you may need longer wires, the distributor may hit the head and you may need to change the cam window between the 1 and 4 window style depending on what management you are using.
The 9A rods are way to short to use in the ABA block. Also using the 95.5 TDI crank with either 9A or ABA pistons will give you a fairly high compression ratio (somewhere in the 10.5-11.5:1) which will be too high for turbo.
Also you only gain .05L from the TDI crank, you could just turn up the boost 3 psi to get the same gain. Maybe if you use the ABA pistons and have them valve clearanced and them add a head space or several gaskets you can get the compression down enough for a turbo, or you could get eurospec sport ones for the ABF with an 95.5mm stroke and add a headspacer.
The cost of a TDI crank vs. the cost of an intercooler to use more boost, I know which one I would choose.
The ABA pistons are also shorter than the 9A pistons. Heres a good link to find your compression: http://not2fast.wryday.com/tur...shtml
Modified by all-starr-me at 1:00 AM 11-27-2004
Thanks for the tips Jason. You could get the compression down enough with a spacer and a head gasket on either side? I know they spacer a normal 16v motor to bring down the CR for boost. A 9A is like 10:1 right? See, I already have a 95.5 crank that is new, and JE pistons[9A] that are 83.5mm. I have all the internal 9A stuff I need. I just have to get a ABA. Hey do you ride BMX? I have friends that work at FBM by you. Thanks again.
The 9A pistons (rebushed) with ABA rods yield ~9.2:1 with an ABA crank, the TDi crank adds ~ 1 more point of compression so you would have ~10.2:1 (too high for turbo). What compression are your pistons for? 9A is 10.8:1 stock and yields ~10.2:1 in ABA with TDi crank so to approximate compression subtract 0.6 points from whatever your pistons are for.
You could prabably get the pistons dished out a little more by a machine shop, or just go with an EIP or C2 headspacer to get the compression your shooting for. I used to skate with some of the FBM guys, not so much anymore.
Wow, you just confused the crap out of me. LOL. It's hard to say but the pistons look like stock shaped JE's. I keep reading what you wrote and it's starting to make sense. Man I'm thick skulled. LOL. I want to get 8.5:1. I have to loose 2.'s of CR. Will deshrouding the valves and polishing the combustion chaber gain me some then maybe spacer it. Man, I hate to use a spacer.
Quote, originally posted by vwpat » The 9A pistons (rebushed) with ABA rods yield ~9.2:1 with an ABA crank, the TDi crank adds ~ 1 more point of compression so you would have ~10.2:1 (too high for turbo). What compression are your pistons for? 9A is 10.8:1 stock and yields ~10.2:1 in ABA with TDi crank so to approximate compression subtract 0.6 points from whatever your pistons are for.
Maybe if I dish the piston a little and deshroud the valves in the head I can make up 2.'s of CR. That seams like a lot to make up. Man this sucks! LOL.
Quote, originally posted by all-starr-me » You could prabably get the pistons dished out a little more by a machine shop, or just go with an EIP or C2 headspacer to get the compression your shooting for. I used to skate with some of the FBM guys, not so much anymore.
ive been readin this whole thing, and im still a little unclear. Im gunna turbo my setup, and i have a 1.8L 16v motor and an ABA tallblock. Am i set with parts? or do i still need the 9A intermediate shaft and sprocket, pump gear, and oil pump?
Modified by azninferno at 11:48 PM 11-28-2004