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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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RPM or DISPLACEMENT 1 2

October 23, 2003 by Tourniqet
14 replies

2.4k views
Another novice question probably. I have a 2.4 with dgv's and a 2.5 inch exhaust and I love the high RPM's... The Tach says it goes up to around 7000 and even more. I was racing a 2003 honda civic si, and I beat him on high revs alone. I want more power from my engine, and sone solid upgrades would probably be boring it ot to a 2.6 or boring and stroking to a 2.8. I have heard that stroking the engine will significantly lower the usable RPM. I just bought an e-31 head, and plan on inspecting it, doing some polishing and maybe porting. If I can find a good machine shop I may get it milled. ANYWAY I wanted to know if you guys had experience or opinions with different …

Last reply by Bambikiller240, October 24, 2003
Starting your car 1 2

October 22, 2003 by halz
18 replies

2.6k views
Well my 240Z has been in the garage for about a fortnight now (no, not the whole time!) and we are slowly building mutual respect for one another. One aspect of this is starting up from cold. I use the folowing technique: 1. pull on max choke 2. crank until it splutters on 2-3 cylinders 3. reduce choke to about 1/4 and crank again 4. Try not to use the throttle at all during this procedure. It always takes a min or so to get running and I assume this is due to a combinaiton or reasons...namley getting fuel to the carbs, getting the right choke position and probably due to old plugs/leads/points. When it does fire up it tends to idle ok but run roughly on less than six c…

Last reply by Mr Camouflage, October 24, 2003
Removing spigot/pilot bushing

October 23, 2003 by JMT240KGTR
2 replies

1.2k views
Guys, Misplaced the tool I had to remove this annoying little thing, this weekend I'm put another g'box in and need to replace it. I read a while back this can be done with grease, a driver and hammer? If anyone can help would be great, thanks.

Last reply by JMT240KGTR, October 23, 2003
Gas filling up air cleaner

October 23, 2003 by sahunt66
2 replies

1k views
Hello, I have a '71 240Z. The car sat several years in a my father's garage. I started it up and it runs fine except gas filled up the bottom of the air cleaner while it was running. What causes this? Should I take the carbs off and rebuild them? Or just use carb cleaner or something? What's a good source for a rebuild kit if I need to do that? I'm new to z-cars and have limited experience in mechanics; but I've done breaks, tune-ups, etc... Thanks!

Last reply by Daniel, October 23, 2003
carburetor velocity stack science

October 22, 2003 by EricB
3 replies

4.6k views
morning, very simply what is the science in choosing the right length of velocity stacks... is it purely as a result of testing on the dyno, are there formulas which one could use to figure out gains vs losses of different length stacks, etc... i've been searching around on the web and while i did find places selling them, i didn't find much explained about the science of picking the right ones... someone here care to help? -e

Last reply by Dtsnlvrs, October 22, 2003
Are L26 exhaust manifolds prone to warping.

October 21, 2003 by Rusty1
4 replies

1.3k views
Hi guys, I recently bought a 260z 2+2 (the +2 is because I have +2 children). The car is original and the engine has been reconditioned. There is a slight exhaust leak at the rear of the manifold and the rear stud is missing from the head. My mechanic thinks that a previous owner may have removed the stud to fit the manifold back on as it is possibly warped out of shape. Before I pull everything apart does anybody know if this is a common fault with the L26? Also can any Oz members adivse, is $150 au too much to pay for a set of second hand extractors.

Last reply by Rusty1, October 22, 2003
Crank Pully Bolt Size

October 20, 2003 by sahunt66
2 replies

1.5k views
For a '71 240Z, what size socket fits on the crank pully bolt? Thanks

Last reply by sahunt66, October 21, 2003
Question regarding intake balance tube. 1 2

October 20, 2003 by 240ZX
12 replies

3.7k views
I've got a question for you all. Regarding the balance tube assembly on a 1970, is it the only balance tube assembly that has the fitting for the brake-vac line that point toward the firewall, as opposed to point up? I'm just curious, because most of the ones I see point up. Mine actually comes srtaight out the back of the balance tube. The vintage of my Z is....1970, mfg date 3/70, s/n 02126. Please help us older guys. P.S. Stay young, as getting old holds no future! Unless you own a seires one Z of course.

Last reply by 26th-Z, October 21, 2003
Headers /Exhaust suggestions 1 2

October 19, 2003 by seerex
13 replies

1.8k views
I have a exhaust leak from the smog crap it rusted a hole in the pipes that come up from the manifold , any thoughts , msa their header or the monza from bv , both very close in price I was considering the 3 to 2 to one from msa anyone has good or bad on them and the exhuast the monza as opposed to the targa? Thanks Jeff:geek:

Last reply by blitzkraig, October 21, 2003
Starting a motor that has been sitting 1 2

October 14, 2003 by drunkenmaster
16 replies

2.1k views
Hey guys, Im selling my L28ET setup as a few of you know and I want to make sure its running for the next owner. The L28E ran fine when I bought it around 6 monthes ago but the battery was flat and I havent started it since as i planned to rebuild it anyway. I know this isnt a huge deal as some of you guys pick up motors that havent been used for several years, but is there any steps i should go through before I charge up a battery and fire her up? Remove the rocker and oil the head etc?

Last reply by drunkenmaster, October 18, 2003
2 row or 3 row ? Radiator

October 17, 2003 by taikaki
8 replies

2.7k views
Hello Zs I have 72' 240 with AC. I am going to replace my after market radiator to Nissan genuine radiator. I would like to know your opinion about 2 row or 3 row. I was thinking. If I have a chance to have new parts, I prefer it's close to original. This means 2.Is 2 row radiator with AC really dangerous ? Thanks

Last reply by Bambikiller240, October 17, 2003
omitting 280z smog stuff

October 12, 2003 by Pennyman
4 replies

2k views
Hi, i have a 76 280z that i just had smogged a few monthes ago, and i think it might be the last time i smog it. you have to smog your car every 2 years in CA and by the time i have to smog it again in 06, the car will be 30 years old, and hopefully smog exempt. my question is whether its posible to get rid of some of the smog stuff on the engine to make the compartment look better and maybe gain a little HP in the process. I've seen some 280zx engines in 240s that have had smog stuff taken off, and they work fine, and look great. im just wondering what you guys think of all this....anyway, thanx as always!! Joey

Last reply by Pennyman, October 14, 2003