Sixer questions

[mike95125]

I'm gonna put a '74 2.7 CIS into my 914. My questions are as follows:

1. Do I need an oil cooler? If so, is it possible for me to mount an oil cooler in the front without ducting the back THROUGH the frount trunk ( I don't want to cut up the trunk)? How about one mounted horizontally under the rear trunk (seen it, but want more info)?

2. Where should I mount the fuel pump?

3. Any words of wisdom that I may have missed? I had more questions, but I can't seem to remember them...more later.

[Zeke]

I ran -10 hoses out of the trunk without cutting drilling. There is a path thru the bulkhead and up along the gas tank and into the pass heat duct. Are you going to cobb together some kind of heat? If so, you might be losing one half of the system and will want to block it off.

You will need -12 hoses min.

[propricer]

Pix from my 914-6 which was set up for a 2.8L. Note that the oil lines do not run down the heater vent and I have not cut any additional openings but I did remove the stock access holes and cut between the holes - saved the pieces for someday when I restore the car to dead stock. Additional pix, if necessary.
Hope this helps.

[mike95125]

Ed, Thats a great idea! I dont use those hoses anyway. My main concern was with the ducting for the cooler. I cant tell how yours is. Did you or milt mount a cooler up front with out cutting the front bulkhead and putting an exhaust duct in the front trunk? I am getting my ideas from the pictures of Patrick Motorsports racing oil cooler kit. Does anyone have pictures of an installed oil cooler? Can I just mount it on the outside under the front fender with a bit of space behind it? Maybe behind a 916 replica front bumper?

Thanks guys!

[propricer]

Ducted out the bottom by removing the two spin outs in the bottom of the trunk and cutting the metal between them.

[mike95125]

Ed, nope, not what I want to do. Do I even need a cooler in the front?

[John Rogers]

Mike. I'd say you are going to need a front cooler with a 2.7L engine. If you drive like I think you do, you will REALLY need one as the stock cooker can't get the air flow necessary! As for the rear mounted cooler, don't waste your time as there is nothing but lots of really hot air back there which won't do much for cooling the oil. If you are worried about cutting the front pan area, then slice it nicely and then save the metal to put back if you ever go back to a four??!! To do the front cooler you'll need the cooler and about 25 feet of the -12 size line. That is a pretty big expense, although you could use hard lines but I would never trust neopreme or rubber hose, even the Parker reenforced stuff that I use for fuel lines. Good luck.

[mike95125]

Paragon lists the -12 stainless teflon line for $4.60/ft. PMS has a 914-6 GT cooler kit for $565.00 that comes with cooler, shroud, and louvered trunk bottom plate. Doesn't sound too bad, but well see. I may be able to get the kit in parts for less, but I am not too sure.

[ber911]

Ed, what front bumper are you using and do you get enough airflow through the original holes in front?

Robert

[propricer]

Front bumper setup is similar to Porsche's one off 914-8 and yes, even with almost 300HP, it provided plenty of cooling.

[mike95125]

Ed, what size hoses are you running? Did they fit in place of the breather hoses ok or did you have to do some cutting?
Thanks!

Mike, I have a 2.7 twin plug in my car. It had an oil cooler mounted under the rear trunk with a scoop and exhaust fan when I bought it. It was okay for running around town but when I started doing track events it was not cutting it. My temps would go up as high as 270 deg. which is not good. I mounted a cooler up front behind the bumper and it rarely goes over 200 deg now. 210 is the highest I've seen. So learn from my experience and don't waste your time with a rear mounted cooler. I have a Chalon kit and my front valance hangs about 6" in front of the chassis which was enough room to hang the cooler against the backside of the valance and exhaust the heat down without cutting into the trunk. You might be able to find a GT style front dam that will allow you to do this. I routed my hoses through the trunk into the passenger footwell and down the longitudinals because my car has become a full track car. I know this is not what you want to do so you'll have to get creative and figure out whats best for you.

[mike95125]

Thanks, Drew

[propricer]

I'm with Drew ... my earlier comments and pix were about my 2.8L six but that is a street car.
I also have a 914-6 with a twin-plugged Euro 2.7L for track only and this requires a bigger oil cooler with better in / out. Consider the early Mazda RX7 cooler - large & cheap.
Good luck ... Ed

[mike95125]

Mine is gonna be a 2.7 with 8.5:1 CR. It will be a street car so I am not trying to overkill it though. Do a 2.8 and twin plugged 2.7s require more cooling?

[red-beard]

Yes. Much higher compression and output. Twin plugs are generally used on 10:1 and higher, to prevent pre-detonation.

[morgan_harwell]

Howdy Mike95125,

I've been running a 2.4L CIS sixer in my 914 street car since 1987, without an external oil-cooler. I do not AX or TT the car. I installed a brand new engine-mounted oil cooler when I 1st put the engine in the 914. I have put around 200K miles on it since, and the highest oil temperature I have ever seen in the car was 230F (it was a very hot day! above 100 degrees). Normally the oil temp is between 180 and 210 degrees.

--Moe--

[Dave at Pelican Parts]

I believe that JPIII does not have an external cooler on his RS-copy engine'd Six. Then again, he lives up in the PacNW, where it doesn't usually get all that hot.

I am told that the late bumper (75-76) provides plenty of room for a cooler underneath it, and that you don't have to cut holes in the body if you put the cooler up there. High Performance House in Redwood City CA sells fiberglass versions of the late front bumper for exactly that reason.

--DD

[J P Stein]

Dave:

Pay attention, man
I didn't have one with the 2.4L T motor. The 2.7L is a different animal. ......

[J P Stein]

One more.....refinement.