N12Turbo.com lanyards are now available! Click here to visit the shop

E13S vs E15 heads

General chat related to anything N12.
Post Reply
User avatar
TurboZ.Dude
Posts: 1360
Joined: Wed Nov 22, 2006 4:25 pm
Location: Närpes, Finland
Contact:

E13S vs E15 heads

Post by TurboZ.Dude »

Hey there guys,

I have a slightly cracked 25M head; engine's running fine but it's only a matter of time before the crack expands to the oil or water galleries.

Recently got my hands on a N13 (with E13S engine) which will be going to the junkyard and I'm allowed to take parts off it for free before they take the car to the junk yard. I started thinking about the E13S head, and wonder if it's possible to use it on my E15 without drop in performance.

Does the E13S head differ in valve size, port size or combustion chamber size as opposed to the different E15 heads?

I recently saw a photo of an early E13 engine and it had a 15M head on so I got curious if the E13S would (from factory) be using a similar (almost identical) head to the one used on the E15 engines. It may be that someone just had dropped a 15M head from an E15 onto that E13 I saw, I cannot confirm that information so it's better to ask the experts before doing something foolish.

I haven't found any reliable information about E13 and E13S heads online, can someone shed some light onto this subject?

Also, are there any other N13 parts you would recommend me to grab off the car with regards to my E15ET project? It does not have power steering or any fancy stuff.
My N12:
http://forum.n12turbo.com/viewtopic.php?t=4926,
http://www.zxoc.co.uk/forum/topic.asp?TOPIC_ID=6345
http://forums.mightycarmods.com/showthr ... Pulsar-N12
Image
in all honesty dude these cars are shit but they have so much character, are fun and go fairly well when running right. we still play around with these things because they are a fun addictive little shitbox! :D - Ash
User avatar
tassuperkart
Administrator
Administrator
Posts: 5578
Joined: Wed Jul 05, 2006 8:39 pm
Location: Southern Tasmania
Contact:

Post by tassuperkart »

Somebody fitted that 15M head as an exchange at some stage in the E13's life. Would have been a good chageover if the compression was kept up.
I dont have any data on the E13 heads. They are very rare in Oz. I have only ever seen one.

The head will drop straight on but I have no idea on combustion chamber volumes.
I cant remember but if your running an NA, you might run into troubles with compression.

No doubt you have checked out the article on different E15 heads here:

http://forum.n12turbo.com/viewtopic.php?t=4613

As you can see, despite the heads appearing identical and bolting straight on, they are all significantly different.

Everything on the E13 engine and car will transplant over apart from the crank. The gearbox (should) has a very handy (IIRC 3.8) diff ratio as well altho its the much lighter/weaker style of gearbox fitted to NA's.

Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.
User avatar
TurboZ.Dude
Posts: 1360
Joined: Wed Nov 22, 2006 4:25 pm
Location: Närpes, Finland
Contact:

Post by TurboZ.Dude »

Alright, thanks m8! Didn't expect them to be rare in Australia, it seems you guys get almost all the car models and editions Japan exports, whereas here in Europe only a few models get on the market.

On another note, I have a bit of issues with hesitation when lugging. And pushing the pedal makes it go dur-du-du-du-du-durdurdurdurRRRRRNNNN and then it goes fine. Sometimes it's hard to get it moving from an intersection if I've been pushing the engine hard and then coming to a red light, it misses on idle and coughs and hesitates when I try to accelerate. I've cleaned up and actually replaced the carburetor, replaced spark plugs, distributor cap and rotor, ignition coil, nothing seems to make a difference. The engine will also start on three cylinders rather often but after a minute or so it stabilizes and runs on all four.

Point is; it definitely sounds like it is misfiring, definitely not like the engine would be trying to seize a piston. I've got a moist intake manifold gasket, can that cause this kind of a problem if it's leaking slight amounts of coolant into cylinder 4, for example? I did a compression test when the engine is warm; cylinder one makes 122 psi, cylinder two makes 138 psi, cylinder three makes 121 psi, and cylinder four makes 132 psi. Oil control rings leaking on hard accelerations and/or lugging accelerations and causing misfires perhaps? Doesn't smoke large amounts of blue or white though...

Could these hesitation/misfire issues have anything to do with the head? It's cracked on cylinder 3 between the spark plug and the exhaust valve seat, but haven't had any trouble with the engine until now. Been running that head for more than a year in that condition after discovering the crack.
My N12:
http://forum.n12turbo.com/viewtopic.php?t=4926,
http://www.zxoc.co.uk/forum/topic.asp?TOPIC_ID=6345
http://forums.mightycarmods.com/showthr ... Pulsar-N12
Image
in all honesty dude these cars are shit but they have so much character, are fun and go fairly well when running right. we still play around with these things because they are a fun addictive little shitbox! :D - Ash
User avatar
TurboZ.Dude
Posts: 1360
Joined: Wed Nov 22, 2006 4:25 pm
Location: Närpes, Finland
Contact:

Post by TurboZ.Dude »

Well, I've been able to ascertain that I do have a problem with a sticking vacuum advance. That could indeed explain the odd engine misfires which come after pushing the engine (or using a lot of vacuum advance). If it sticks occasionally, it will most definitely not advance ignition enough, or not retard it back. On some hard accelerations it does just that; it continues accelerating a second after releasing the pedal fully.
My N12:
http://forum.n12turbo.com/viewtopic.php?t=4926,
http://www.zxoc.co.uk/forum/topic.asp?TOPIC_ID=6345
http://forums.mightycarmods.com/showthr ... Pulsar-N12
Image
in all honesty dude these cars are shit but they have so much character, are fun and go fairly well when running right. we still play around with these things because they are a fun addictive little shitbox! :D - Ash
gettu
Posts: 159
Joined: Sat Aug 26, 2006 5:09 pm
Location: Riihimäki [FINLAND , EU]

Post by gettu »

Motonet has new diaphragms.

the shelves are empty though. it is possible to order one. might take some time.
User avatar
TurboZ.Dude
Posts: 1360
Joined: Wed Nov 22, 2006 4:25 pm
Location: Närpes, Finland
Contact:

Post by TurboZ.Dude »

gettu wrote:Motonet has new diaphragms.

the shelves are empty though. it is possible to order one. might take some time.
Long time, no hear m8, nice to hear from you! :) Thanks for the tip, I had given up hope of being able to buy a brand new one and was considering to go to the junk yard to fetch one.
My N12:
http://forum.n12turbo.com/viewtopic.php?t=4926,
http://www.zxoc.co.uk/forum/topic.asp?TOPIC_ID=6345
http://forums.mightycarmods.com/showthr ... Pulsar-N12
Image
in all honesty dude these cars are shit but they have so much character, are fun and go fairly well when running right. we still play around with these things because they are a fun addictive little shitbox! :D - Ash
User avatar
tassuperkart
Administrator
Administrator
Posts: 5578
Joined: Wed Jul 05, 2006 8:39 pm
Location: Southern Tasmania
Contact:

Post by tassuperkart »

Most likely the moving plate in the dissie is grubby.
They can be easily pulled apart, cleaned a sorted.

Oracled
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.
User avatar
boosted
Posts: 285
Joined: Tue Sep 26, 2006 10:10 am
Location: Austria

Post by boosted »

TurboZ.Dude wrote:... I had given up hope of being able to buy a brand new one and was considering to go to the junk yard to fetch one...
jan, never give up hope:
http://www.unet.univie.ac.at/~a0101005/DSCN8179k.jpg ( NOS :twisted: )
actually i planed to use it to get rid of the bloody point igntion system on our renault r4.

if your vacuum advance proves to be faulty and you cannot source an other one, contact me ;-)
greez
martin
Post Reply