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Engine & Drivetrain

Post messages here about engine mechanics, exhaust, intake, etc. Anything to do with the engine system as a whole.

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Outside air temp affecting running, what gives

July 10, 2004 by 77 Z
1 reply

1.1k views
The hotter the day gets the better my 77 Z runs, the engine temp does not rise according to the temp gauge, but when the outside temp is in the upper 80's to the mid to upper 90's the car just gets better and better , the engine smoother and smoother..can someone tell me why this is happening.. Again the overall engine temp is great , could it be a air fuel mix that as the air becomes hotter it allows for the engine to run smoother or what... Could I have possible when looking at the inside of the air flow meter ( a lttle more than looking) accidently without knowing it made a change that would make for someting like this to happen) ... 77 Z

Last reply by 77 Z, July 10, 2004
Outside air temp affecting running, what gives

July 10, 2004 by 77 Z
0 replies

1.2k views
The hotter the day gets the better my 77 Z runs, the engine temp does not rise according to the temp gauge, but when the outside temp is in the upper 80's to the mid to upper 90's the car just gets better and better , the engine smoother and smoother..can someone tell me why this is happening.. Again the overall engine temp is great , could it be a air fuel mix that as the air becomes hotter it allows for the engine to run smoother or what... Could I have possible when looking at the inside of the air flow meter ( a lttle more than looking) accidently without knowing it made a change that would make for someting like this to happen) ... 77 Z

Last reply by 77 Z, July 10, 2004
Embarrassing Question 1 2

July 8, 2004 by Zrush
12 replies

2k views
Please don't laugh but I must ask this question. OK here goes. When you modify the internals of an engine, does it change the bore and stroke? If it does, how would one go about finding out the new figures. Vicky

Last reply by 1971rb26dett, July 10, 2004
Dyno results - what do you think? 1 2

June 26, 2004 by 240ZMan
17 replies

3.8k views
I just got back from our local Z club event at the dyno. Results are attached. My engine is as follows: - N42 block with dished pistons (~80k miles) - E31 head (stock valves, ~10k on rebuild) - MSA 6:1 header w/2.5" exhaust - Pertronix electronic ignition - SU round tops with ZTherapy bodies, and .099 nozzles and SM needles I live at 6500 ft elevation although the shop was about 1000 feet lower. They say the results are corrected for altitude, temperature, etc. I tried 2 other runs. On one I turned the mixture nuts in (leaner) 1 full turn. On the other put the mixture back, and advanced the timing 4 degrees. In both cases peak HP dropped ~3 hp. So I figure I…

Last reply by 1971rb26dett, July 10, 2004
Engine guru rebuild question

July 7, 2004 by xtinc
5 replies

1.7k views
Hi, I'm in the process of rebuilding my motor, an L26 block and early E88 head. I purchased the block from a guy who gave up on his Z project, it had been rebuilt by a reputable shop, bored .030, polished crank, and balanced. I noticed the spec sheet indicated the deck had been shaved, but didn't indicate exactly how much. I'm assuming very minimal to clean the deck surface. The E88 came off my L24, I wasn't the original owner so not sure of previous head work, but the machine shop also shaved a very nominal amount to clean up head surface, timing components are new. I installed the timing set with everything at TDC, lined up the bright links with timing marks using…

Last reply by xtinc, July 8, 2004
Hmm......?

July 7, 2004 by MrMarcDude
5 replies

1.7k views
(78 280z) Sorry if i sound super dumb here but bare with me, im new ta this . While cleaning up the engine bay today i noticed that there is a belt missing from the engine. It is the belt that goes to that giant thing that looks like a pump or motor of some sort. I traced the lines and it connects to what looks like a smaller radiator thats in front of the real radiator. I was wondering. What is that giant pump lookin thing, and can my engine fare without it? That thing with all of the hoses, and lines really creates a lot of clutter. Just trying to make underneath the hood look a little better. Thanks guys

Last reply by MrMarcDude, July 7, 2004
Spark Plug Gap

July 3, 2004 by Datsun-Fever
4 replies

2k views
Hey guys, i just got my intake, wires and spitfire spark plugs, im wondering what the gap should be on them? its a factory coil by the way. Thanks.

Last reply by gema, July 7, 2004
260Z exhaust manifold question

July 5, 2004 by felnik
6 replies

2.8k views
I've got this 260Z thats been sitting for quite a while. check out my last post for details. I'm in the process of accessing whether or not to get into it. Logic says no but the nut in me says go for it. Anyway, the car has triple Webers and I see this iron pipe coming up from under the manifold running parellel to the valve cover with little pipes coming up from the exhaust manifold. First of all what is this thing, is it emissions related? Its rusted pretty bad and would most likely leak like crazy if the car was running I can imagine flames blasting out fo the thing. what to do, what to do. any thoughts?? jf

Last reply by felnik, July 7, 2004
Cast Oil Pan fitment FYI

July 6, 2004 by EricB
0 replies

1.1k views
So I struggled with it some more this weekend and basically because of how the top baffle plate is cut out to allow for the oil pickup you will not get the pan on without dropping the tranny if the engine is still in the car... Of course if you're doing this on an engine already out of the car and on a stand then there's no problem... (Something I was never told when purchasing it...) Anyways after a lot of work I did get it on but I thought I should let you all know in case someone else was thinking it would be a quick install... Oh and it now holds about 7qts when filled to the "H" mark on the dipstick... -e

Last reply by EricB, July 6, 2004
New Radiator (Where should I buy?)

July 5, 2004 by frankensteinZ
8 replies

1.7k views
Hey whats up guys, what a hot summer it has been. So hot in fact that my radiator of probably 20 years decided to take a big dump on me. I called up motorsports and its 200 bucks for a new one, but they have a 2 week wait till they get some more in stock. I need this thing now cuse the z is my daily driver. There are alot of other z parts dealers out there, anybody have any suggestions on a reputable place with good parts to try so I can get back out on the road asap. (and not VB, never again will I buy from them, their parts are crap) Let me know. Frankie

Last reply by Sean240Z, July 6, 2004
Do I have to change the head gasket?

June 27, 2004 by 240ZMan
5 replies

1.2k views
I dropped the smaller washer from the cam gear down the front timing cover (don't ask how :stupid: ) and I'm resigned to taking the front of the engine off to get it. A few questions: 1. Do I have to worry about it falling further into the oil pan? 2. Do I have to loosen/remove the head? 3. If the answer to 2. is yes, do I have to change the head gasket? Thanks,

Last reply by Fun_in_my_z, July 4, 2004
How do you install headers? Underneath or remove intake?

June 30, 2004 by PrOxLaMuSÂ©
6 replies

2.4k views
I have an extra set of headers lying around.. :devious: some MSA 3-2 headers and I wanted to finally install them. Now in order to install them do I have to remove the intake manifold or can I go from underneath? I called Midas and Mienike's muffler and exhuast shops as well as a few local shops, and on average... if I PROVIDE the twicepipes exhuast setup and the header's for them, they will charge $400 on average to install it!!! So obviously it would be easier to install it myself and I wasn't sure exactly how to install the headers... i tried a search and not alot of luck

Last reply by seerex, July 4, 2004