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> 3.0L six conversion, disbanding the CIS injection
boxsterfan
post May 11 2015, 09:13 PM
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So as I am preparing to tear my car down for restore, I have possibly found a 3.0L six cylinder motor that I can afford (and afford to have rebuilt). Note: My car is a 2.0L 4-banger.

I know that the 3.2L is a very popular upgrade. For the 3.0L six, what can I expect out of that motor? Do I have to run the CIS injection or can I go ITB's (or other intake setup) and megasquirt setup?
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iamchappy
post May 11 2015, 09:26 PM
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3.0 reliable almost bullet proof engine, nothing wrong with the CIS it's the easiest and engine runs well with it , $ carbs, or $$ EFI. A more affordable engine would be one that you dont have to rebuild. install it and drive it, thats what i first did for the few years until i wanted more performance.
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Cairo94507
post May 12 2015, 06:56 AM
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I had a 3.0 CIS motor in my last Six and it ran perfect from day one and never disappointed.
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Krieger
post May 12 2015, 07:55 AM
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Cis is great, but carbs will give you more power (dual Webers). 1 1/2 headers or stock 914/6 heat exchangers give best overall power.
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Dave_Darling
post May 12 2015, 08:30 AM
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You can fuel it any way you want. Carbs, CIS, or some flavor of EFI will all work. The CIS is nice in that it and the engine were set up for each other, but the other setups have their own strong points as well.

You'll either have to flip the fuel meter and air box around or notch the rear trunk bulkhead for clearance if you go with CIS.

--DD
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Steve
post May 12 2015, 08:59 AM
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There is a kit to convert the CIS to DME. They claim a 14 hp increase.
http://www.autosportengineering.com/cis_to_efi.htm
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Jeffs9146
post May 12 2015, 09:33 AM
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I love my 3.0L CIS motor! I modified the injection orientation so I didn't have to cut the trunk. It involved removing the airbox and replacing the intake AFR box with a Volvo 242 AFR mounting box.

You are welcome to come by and look at it, or test drive it, anytime!


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JmuRiz
post May 12 2015, 10:40 AM
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QUOTE(Steve @ May 12 2015, 06:59 AM) *

There is a kit to convert the CIS to DME. They claim a 14 hp increase.
http://www.autosportengineering.com/cis_to_efi.htm

That's Megasquirt v1 right...same setup as the old BitzEFI system, right?
Just with more period correct looking connections. If it's running v3, then you might be onto something...
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boxsterfan
post May 12 2015, 01:04 PM
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Wow! Lots of great info. Thanks!!

I'd prefer not to notch the rear trunk bulkhead. For those with the 3.0L six with CIS, what did you do to the transmission? Change gearing at all for a taller 5th gear?

I'm not looking to track the car when I rebuild it. I'm looking for a performance street car.
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Jeffs9146
post May 12 2015, 01:50 PM
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I have been waiting for another Dr Evil clinic to install my flipped H gear!
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Luke M
post May 12 2015, 02:09 PM
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Go over to the Pelican site and do a search on the 3.0 EFI conv. there's good info there.

The trans on my brothers car was totally rebuilt. It got all new bearings, and different gear ratios from 2-5. The new gear ratios are A-1st, GA-2nd, O-3rd, X-4th, Flipped H-5th. Just don't beat on it in 1st gear and you should be good to go.
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Steve
post May 12 2015, 02:13 PM
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QUOTE(JmuRiz @ May 12 2015, 09:40 AM) *

QUOTE(Steve @ May 12 2015, 06:59 AM) *

There is a kit to convert the CIS to DME. They claim a 14 hp increase.
http://www.autosportengineering.com/cis_to_efi.htm

That's Megasquirt v1 right...same setup as the old BitzEFI system, right?
Just with more period correct looking connections. If it's running v3, then you might be onto something...

I don't know anything about it. I just stumbled across it looking for 3.2 fuel lines.
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Jeffs9146
post May 12 2015, 05:31 PM
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Just saw this on a link in one of the topics at the Pelican.

The parts showing the cutting of the air box are very similar to my modification to avoid the cutting of the trunk wall.

CIS to EFI Conversion
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VegasRacer
post May 12 2015, 09:26 PM
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QUOTE(Jeffs9146 @ May 12 2015, 08:33 AM) *

I love my 3.0L CIS motor!

(IMG:style_emoticons/default/agree.gif)

My trunk is notched. It bothered me at first, but it is no big deal now.
Following Elliot's designs, I will get around to making a collapsible targa top to fit in the trunk.

I have tried other combinations but am very happy with the stock gear box for use as a performance street car with an occasional track day.
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barefoot
post May 13 2015, 09:03 AM
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QUOTE(boxsterfan @ May 11 2015, 11:13 PM) *

So as I am preparing to tear my car down for restore, I have possibly found a 3.0L six cylinder motor that I can afford (and afford to have rebuilt). Note: My car is a 2.0L 4-banger.

I know that the 3.2L is a very popular upgrade. For the 3.0L six, what can I expect out of that motor? Do I have to run the CIS injection or can I go ITB's (or other intake setup) and megasquirt setup?

Hopefully you can find a 1980 or 81 SC motor. 1980 was first year to incorporate Lambda O2 sensor to provide mixture feedback to the CIS system.
I had used that to fine tune the idle mixture using a multi meter tapped into the O2 sensor output wire to get the mixture right. made a noticible improvement in low speed power. (guess some PO had messed with the mixture)
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boxsterfan
post May 13 2015, 01:30 PM
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QUOTE(Luke M @ May 12 2015, 01:09 PM) *

Go over to the Pelican site and do a search on the 3.0 EFI conv. there's good info there.

The trans on my brothers car was totally rebuilt. It got all new bearings, and different gear ratios from 2-5. The new gear ratios are A-1st, GA-2nd, O-3rd, X-4th, Flipped H-5th. Just don't beat on it in 1st gear and you should be good to go.



I am aware that 1st is the weak gear on the 901. Can anything be done to help out? I'm not saying I'm going to drag race from every stop sign. I'm also not saying I won't. (IMG:style_emoticons/default/biggrin.gif)
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mepstein
post May 13 2015, 01:32 PM
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QUOTE(boxsterfan @ May 13 2015, 03:30 PM) *

QUOTE(Luke M @ May 12 2015, 01:09 PM) *

Go over to the Pelican site and do a search on the 3.0 EFI conv. there's good info there.

The trans on my brothers car was totally rebuilt. It got all new bearings, and different gear ratios from 2-5. The new gear ratios are A-1st, GA-2nd, O-3rd, X-4th, Flipped H-5th. Just don't beat on it in 1st gear and you should be good to go.



I am aware that 1st is the weak gear on the 901. Can anything be done to help out? I'm not saying I'm going to drag race from every stop sign. I'm also not saying I won't. (IMG:style_emoticons/default/biggrin.gif)

Drop in a 930 tran$
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Jeffs9146
post May 13 2015, 02:23 PM
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I don't use first, no need! (IMG:style_emoticons/default/w00t.gif)
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Mark Henry
post May 13 2015, 08:29 PM
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Carbs or EFI is a slippery slope...then you will want to upgrade the cams $1000... etc.
Rebuild can get upwards of $8k if you can DIY, expect double or more for a pro, that plus the core. I did it all myself including machining and I bet I have well over $11K in the engine.

The 3.2 is really only popular because of the excellent FI system, the 3.0 actually is a stronger engine because the rods have bigger bolts.

901 is fine, IIRC my trans is a A,F,O,X, HA.
Flipped HA gear is almost as good as a H, in my case already I had a HA in my pile.
Take off from 2nd, only use 1st as a granny gear on a grade.
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