3.1 liter question.

p8ntman442 · Post by **p8ntman442** » Sat Oct 29, 2005 8:09 pm

Last weekend I did a timing chain gasket on a 96 skylark 3.1. When I pulled the harmonic ballancer there was a magnetic pickup behind it and the ballancer had a reluctor ring on it. Is this how the 3.1's pick up crank signal? I thought they would have a casting in the block, but I didnt look. If so, when I run DOHC on the aluminum engine (if it happens) I could use the 3.1 ballancer and the pickup (moddified to stay on the block) for the ignition system. I was planning on an aftermarket system like this, but it appears the 3.1 already has the setup.

donk_316 · Post by **donk_316** » Sat Oct 29, 2005 10:10 pm

what what what WHAT??? seriously??! get some friggin pics! i might be saved after all!!

TurboGT · Post by **TurboGT** » Sat Oct 29, 2005 11:08 pm

Yes that was the crank shaft position sensor. GM did this on allot of their fwd engines. They have moved the sensor into the block on some engines ( dont ask me what ones ). On most of the older models you have to have a tool to allign the sensor so the balancer dosnt chew it up after you install it.
The nice thing about the sensor being there is if the car dies and wont start and that is the reason ( happens more than you would think ), you can spray the sensor with some brake cleaner or anything cold and the car usually fires right up. This only works if the car dies when it gets hot. Then you dont have to push the car into the shop/ tow it to the shop and it diagnoses the problem.

Shaun41178(2) · Post by **Shaun41178(2)** » Sun Oct 30, 2005 1:43 am

Donk its a different reluctor ring then the signal you wuold use. It is a 24X I think. The obd 1 computer isnt' setup to use the same timing ring on the balancer that I know of.

Meaning I dont' think it is possible for you to take the balancer from a 3X00 car and use the obd1 computer to get the crank signal from.

if you can then I do beleive I have a balancer here which you can have.

Talk to sappy on 60 degree or hell maybe he will see this and reply here.

v6h.o. · Post by **v6h.o.** » Sun Oct 30, 2005 6:23 pm

p8ntman442 wrote: Is this how the 3.1's pick up crank signal?

No as stated thats the 24X crank trigger. It is used in conjunction with the Camshaft Possition sensor for SFI opperation.

The gen3's (3x00's) still use the same 7X reluctor on the crank and the same CKP sensor at the back of the block for ignition/crank signal.

donk_316 · Post by **donk_316** » Sun Oct 30, 2005 6:32 pm

So this 24x crank pulley deal is an OBD2 thing? So I cant use a 7730 then to run it?

Shaun41178(2) · Post by **Shaun41178(2)** » Sun Oct 30, 2005 6:49 pm

Hey Colin. Welcome. good to see you here. :thumbleft: It is primarily a fiero board but we talk about other cars too in the "otehr cars" section so feel free to check that out. Some good videos in there.

Also Donk I do believe its a OBD 2 thing. THe 7730 uses the 7X crank signal for the ECM

You have the DOHC blocks taht have the crank position sensor so what do you need the SFI balancer for?

v6h.o. · Post by **v6h.o.** » Sun Oct 30, 2005 7:03 pm

Shaun41178(2) wrote:Hey Colin. Welcome. good to see you here. :thumbleft: It is primarily a fiero board but we talk about other cars too in the "otehr cars" section so feel free to check that out. Some good videos in there.

Thanks Shaun.

donk_316 · Post by **donk_316** » Sun Oct 30, 2005 7:14 pm

Shaun41178(2) wrote:Hey Colin. Welcome. good to see you here. :thumbleft: It is primarily a fiero board but we talk about other cars too in the "otehr cars" section so feel free to check that out. Some good videos in there.

Also Donk I do believe its a OBD 2 thing. THe 7730 uses the 7X crank signal for the ECM

You have the DOHC blocks taht have the crank position sensor so what do you need the SFI balancer for?

Forged crank has no provision for crank sensor.

Shaun41178(2) · Post by **Shaun41178(2)** » Sun Oct 30, 2005 7:16 pm

Make one like the Raven did then.

Or go to a good machine shop and have them cut the marks in with the specs you give them. Then have it all rebalanced

The Dark Side of Will · Sun Oct 30, 2005 9:24 pm

Shaun41178(2) wrote: Also Donk I do believe its a OBD 2 thing. THe 7730 uses the 7X crank signal for the ECM

Negative... the 7730 uses the 3x signal from the coil pack. The coil pack uses the 7x signal from the crank sensor.

donk_316 · Post by **donk_316** » Sun Oct 30, 2005 9:28 pm

Well what ecm does a "96 buick 3.1L" use then?!

The Dark Side of Will · Sun Oct 30, 2005 9:29 pm

Dunno, but something more advanced than the 7730 (IE, OBDII and electronic transmission control).

p8ntman442 · Post by **p8ntman442** » Sun Oct 30, 2005 10:21 pm

whats the big deal, you got a 24x wheel, and a pickup, have the wheel made to have 7 tabs and its all done for you donk.

The Dark Side of Will · Mon Oct 31, 2005 8:12 am

That's basically what I was thinking. A laser cutter could whip up something like that easily.

donk_316 · Post by **donk_316** » Mon Oct 31, 2005 9:04 am

p8ntman442 wrote:whats the big deal, you got a 24x wheel, and a pickup, have the wheel made to have 7 tabs and its all done for you donk.

Cool idea. So take this setup and "Recut it" ...ok. Thats a good idea.

The Dark Side of Will · Mon Oct 31, 2005 9:09 am

'96 3.1? I thought the 3100 was out by '96?

Does it have a coil pack? Might be able to just use the coil pack from that engine with whatever ECM you want.

p8ntman442 · Post by **p8ntman442** » Mon Oct 31, 2005 1:16 pm

maybee 95, it had the coil packs. Its deffinatly a 3100 I doubt you could recut the wheel, its like a metal screen. I could however build you a circuit to condition the signal from a 24x to a 7x output. Let me know if you want to go that way.

donk_316 · Post by **donk_316** » Mon Oct 31, 2005 2:02 pm

p8ntman442 wrote:maybee 95, it had the coil packs. Its deffinatly a 3100 I doubt you could recut the wheel, its like a metal screen. I could however build you a circuit to condition the signal from a 24x to a 7x output. Let me know if you want to go that way.

Do I need to appologize for calling you names first?

The Dark Side of Will · Mon Oct 31, 2005 3:54 pm

p8ntman442 wrote:maybee 95, it had the coil packs. Its deffinatly a 3100 I doubt you could recut the wheel, its like a metal screen. I could however build you a circuit to condition the signal from a 24x to a 7x output. Let me know if you want to go that way.

Define "like a metal screen". You didn't take pics, did you?

This particular laser can cut any 2D shape desired out of anything from sheet metal to 3/4" plate.

Where is the pickup for this wheel attached?

Real Fiero Tech

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