Jake, just a quicky "Q" for this 4th of July weeke

speedy57tub · Post by **speedy57tub** » Fri Jul 02, 2004 7:57 pm

Jake,
In trying to break in my engine this weekend, I took it for a ride. I was going to try to run it hard but I all of a sudden my oil temp was going up and I got concerned so I let off. I was running about 260 degrees and I even got some oil that appears to have leaked out around the pulley area which puzzles me cause I have an oil seal and I just vented the front of my case. Maybe I need to remove that tight sponge in my air breather and replace it with a looser one. I do seem to have a lot of air routed from my 911 fan to that cooler enclosure I built, especially at the higher RPMs, so I do not think that is the problem.

Anyway, I am wondering what you think my timing should be at 3000 RPM. Also, I am using chromoly pushrods and currently have them at .001 for the intake and at .002 for the exhaust, do you think this okay?
I am worried about the oil temp and am trying to see what I can do to correct it. I will have to get a new timing gun since mine just went bad. PLEASE HELP, I'd like to be able to enjoy this long weekend.

speedy57tub · Post by **speedy57tub** » Fri Jul 02, 2004 8:03 pm

Oh yeah, the specs of the engine in my Speedster Replica just in case you forgot (you being so busy and all):

2110-cc Type I
40 x 35.5 CB Performance 044 heads with double springs (no P&P)
122/125 WEBCAM and 1.1 rockers with 911 adjusters
9.5 CR
911 fan (I know, Iknow....) LOL
Remote cooler cooled via air from shroud
30-mm Melling full flowed with oil thermostat
Mallory Mechanical advance with double grey springs
1-5/8" merged header with temporary supertrapp

speedy57tub · Post by **speedy57tub** » Fri Jul 02, 2004 9:50 pm

bump!

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Sat Jul 03, 2004 11:06 am

Your running a bit hot! The oil leaking from the front seal area is indicative of crankcase pressure that is occuring probably from over-expansion of the cylinders at temperature...

I would say to double check the timing at full advance and set it to 28 degrees, and then ensure you are not running lean.

Pull the foam out of the breather box will help.....

BUY A CHT GAUGE AND INSTALL IN ON #2, it frys with *most* 911 fans while 1-3 are cool.....

speedy57tub · Post by **speedy57tub** » Sat Jul 03, 2004 11:29 am

Jake,
I did run it again today. I do notice that when I rev it up, I get alittle popping at about the midrange RPM. What jetting should I try? First I will recheck my timing, then I will play with the jetting. I will get a CHT gauge since I do not longer have one (it went with my other car). Is there one you recommend? Thanks for your help!

oh yeah, you think my valves (CB Performance chromoly) are okay set at .001 intake and .002 exhaust?

speedy57tub · Post by **speedy57tub** » Mon Jul 05, 2004 3:33 pm

Bummer Jake, I had to keep my car out of the parade! I checked the timing and it is at approximatelly at 26 degrees advance at 3000 rpm. I then drove it around and my VDO CHT gauge registered about 300 degrees on cylinder #2 (under the plug)and my oil gauge was at about 260 degrees. What is the next step, should it be the jetting? If so, what is the starting point? I don't think it could be my 9.5:1 CR but man, I am frustrated! At times like these, I wish your shop was around the corner!

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Mon Jul 05, 2004 3:52 pm

300 on the heads is fine, 260 on oil sucks! What oil are you running?

speedy57tub · Post by **speedy57tub** » Mon Jul 05, 2004 3:59 pm

10w-30 Castrol. Could it be the oil, jetting, or a combo of this and something else. Man, I wanted to have my car in the parade so the rice burners did not take all of the glory!

By the way, I had these values even when I warmed up and checking my timing without actually driving the car.

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Mon Jul 05, 2004 4:15 pm

Man, that stuff is thin as piss! Run Valvoline or Castrol 20/50 and see what it does, especially in Vegas!

speedy57tub · Post by **speedy57tub** » Mon Jul 05, 2004 4:30 pm

Thanks Jake, I'll do that and check in with you tomorrow.

speedy57tub · Post by **speedy57tub** » Sat Jul 10, 2004 1:06 pm

Okay Jake,
Here is what I found out:

I changed the oil to 20W-50 Castrol GTX and tried the timing between the range of 24-30 degrees. As far as the oil temperature, when I dorve the car around in the Las Vegas heat, each time the head temperature dropped a little as you decreased the advance. At 25 degrees, the head temperature baselined at 290 degrees for number 2 while the oil temperature dropped slightly from 260 degrees to about 250. It did take a little more to get the oil temperature up in comparison with the 10W-30 oil and it looks like the oil spewing from the pulley area has decreased signifcantly or completely.

The only thing I can figure now is that my oil cooler setup, especially in this heat compared to a few weeks ago, is not getting enough airflow. Three possible responsible problems:

1. I do have a mechanical oil thermostat setup that might be allowing some oil to be bypassed away from the cooling therefore not allowing full cooling. I am going to remove it.

2. Given that I have a 911 shroud, the way I am taking air from the shroud to allocate to the cooler may not be working as I expected in these higher LV temps. I am going to fab a scoop for the inside of the shroud to better direct airflow to the cooler enclosure (it is similar to your DTM). Doing this should work better because of the way the airflow is being expelled from the fan. I should be better able to make use of the airflow direction (and not depend so much on air pressure differential within the shroud to move the air) to capture the intended oil cooling air allocation.

3. I am sampling the temreature of the oil on a bypass I made which replaces the Type I oil cooler at the top of the case. For accuracy and proper cooling sampling. is this location fine or should it be immediately after the cooler or before the cooler?

Jake, besides what I know I should done from day one regarding cooling, what do you think? I should of gone Type IV

.....Thanks again.

P.S. I am working on getting you some pics of my Type I stuff so we can talk about the 912.

speedy57tub · Post by **speedy57tub** » Sun Jul 11, 2004 12:53 pm

Bump!

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Mon Jul 12, 2004 7:04 am

I sent you an email...

And yes, you should have went Type IV to begine with!

Guest · Post by **Guest** » Mon Jul 12, 2004 7:14 am

Jake I did not get your email, please resend to :

[email protected] "or" [email protected]

Thanks a lot!

speedy57tub · Post by **speedy57tub** » Mon Jul 12, 2004 7:21 am

And yes, you should have went Type IV to begine with!

Yup, I agree!!

My 912 will get one though!

It is the only way without going the expensive 911 6-banger route.