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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I have a '73 240Z project that is nearing completion (thanks largely to all the parts and advice from you all). Here is my specs so you may be able to diagnose thae problem a little easier. I have put an '81 L28 with the 5-speed in, '70 model SU carbs and intake. The car previously had a L24 and 4-speed with dual Webers when I got it. I ran poorly so I decided a new mill was in order. It previously had a mechanical fuel pump in the engine compartment and the original electric pump back by the tank. I got rid of the mechanical pump when the swap was made, and upgraded to a different electric pump (Was advised to get a Purolator 2-4psi, 30gph pump from Pep Boys, so I did). …
Last reply by Phacade, -
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If the smog pump on a 73 240 is removed are there adjustments to be made with anything? I have just removed mine and capped the ports. A friend swears that i will get 20 horse more out of the old girl, but could not tell me if any adjustments are to be made.
Last reply by Bambikiller240, -
Got a 73Z with 72 carbs.The three front sparkplugs (towards the front bumper) are black when they are removed from the engine for viewing. Is the front carb the culprit? I really don`t have the ba**s to adjust the carbs. It seems as the carbs go so goes the engine performance. Comments, suggestions? MikeT 73
Last reply by tfbrown, -
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Since my last post, I deciced to go with early SU carbs in my ongoing restoration of my '73 240Z. Yep, we got the '81 280ZX L28 going in next week. Since I'm using a P79 head, I must go with an electric fuel pump. I need to know: Which pump to get; Brand, psi, and gallons per hour. And do I simply regulate the line, or do I double regulate right before each carb (leaving the system un-hindered thus avoiding possible vapor lock)? ------------------ "Go into emptiness, strike voids, bypass his defences; hit him where he does not expect you" -Lao Tzu
Last reply by Phacade, -
British SU
by Darby- 0 replies
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I have a 73 Z with english su's.The jets have a red band on the fuel tube and the needle is a SY is this a good setup for a 240 Z? it seems to be running rich. it also has a slight ping in the midrange this may or may not be related. I live at sea level if that helps. now please help me. thanks
Last reply by Darby, -
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1972 240Z. After the car warms--and is idling--the RPM will continually fall then rise, but get progressively lower. I have been told that this is caused by a vacuum leak. Would you guys agree? If so, is there any tried and true method of tracking down a vacuum leak? Thx, Jon thebigboy@earthlink.net
Last reply by Bambikiller240, -
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I am restoring a '73 with the SU flattop carburetors. The car has been garaged for 18 years. I have the engine running but the rear carbuetor is running very rich, the front carb is o.k.However,since there is only the one mixture adjusting screw on the front carburetor I am uncertain as to how to correct this. any ideas?
Last reply by Bambikiller240, -
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Not so much a question as an observation from other members I was wanting. I have a 1973 240Z. We are putting an '81 L28 into her, running dual Weber DGV carbs. Now from talking with a multitude of people on the internet I have come to understand the the '73 originally had two, count them, two fuel pumps; a muchanical and a manual. This was due to the flat-top Hitachi carbs that were prone to vapor lock. My new engine uses the P79 head, therefore it does not have the eccentric for the manual fuel pump on either the head housing or the cam itself. I have therefore decised that since the '73 has a backup electric fuel pump back by the tank to use it's wiring and mount a nic…
Last reply by Phacade, -
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DO N-27 needles work well in 72 carbs? are they compatable with 72 nozzles, will the 70 nozzles work in 72 carbs? ------------------
Last reply by Rmeli, -
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Are the water jackets on the Hitachi Flattop carbs needed. I just bought a 73 240Z that needs all the hoses replaced, I was thinking of blocking the water jackets off. Will this hurt anything that anyone can think of?
Last reply by Mike, -
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Okay People, Here is one for ya. I think it may just be a misbalanced carb. But tell me what you think. First some background: I recently pulled my Z car out, for a move, havn't driven it all winter. And when to start it, and sure enough, battery is dead. So I jumped it, and let it charge, no go. It was so dead that it wouldn't take a charge. I ran down to sears, and exchanged it for a new one, was still under warrenty. And then put it in and turned the key, fires right up. Running a little rough, but what do you except, it's been all winter. I let it warm up, and rev the engine a few times. It settles down right around 1000rpm's where it has always done it. …
Last reply by Chris, -
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I'd like to install a 4 barrell carb system into my L28 powered '73 240Z. What's involved? Which carb do you recommend? What about the linkage? The intake manifold? Any speacial modifications or instructions? Please help me!! ------------------ "Go into emptiness, strike voids, bypass his defences; hit him where he does not expect you" -Lao Tzu
Last reply by Phacade,
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