Cylinder head numbers

Gary57 · Post by **Gary57** » Mon Apr 21, 2008 8:39 am

Ok so I was assembling Trance101's engine this weekend and saw on the exhaust side of the head the numbers 4F 2L. Now on mine and Rat's 2 heads it says 4F 1R or 4F 18 (cant really see which). Anyone what the difference is??

veecee · Post by **veecee** » Mon Apr 21, 2008 7:28 pm

sorry man, dont know...

but on a side note i see the SR20 engines also have plenty of numbers on the cylinder head. there are at least 2 different set of stamped numbers, and one set of cast numbers.

i think the numbers refer to different sets of the same engine.

like the red top engine is a 52C, then the red top FWD is a 53C (AFAIR), the gti-R engine is a 54F. i'm there are different numbers for turbo versus n/a motors, and FWD vs RWD vs AWD motors!

Trance101 · Post by **Trance101** » Mon Apr 21, 2008 11:16 pm

I've tried searching the net but I've come up with nothing so far...

Also quite interested to know what the difference is. Maybe it just got to do with manufacture date or summing??

Gary57 · Post by **Gary57** » Tue Apr 22, 2008 8:04 am

These are cast numbers in the head.

veecee · Post by **veecee** » Tue Apr 22, 2008 9:11 am

then i think my reply applies!

its got to do with the different models of engine in the different configurations.

Vlade · Post by **Vlade** » Tue Apr 22, 2008 9:14 am

It can also be the production line info, if they realize a fault with a cast they need to know where to go and find it... Etc..

I hope we don't get into the 4F is better than the 2B thing...

I remember when I was a Ubër PC overclocker, we where hunting CPU's from certain manufacturing plants since they overclocked better... all for a 100mhz better increase, which in the end of the day... is fuckall... for the amount of effort we went through in hunting down those chips...

Gary57 · Post by **Gary57** » Tue Apr 22, 2008 10:15 am

I would just like to know what the diff is thats all.

Vlade · Post by **Vlade** » Tue Apr 22, 2008 11:06 am

Gary57 wrote:I would just like to know what the diff is thats all.

It means if its got no R in it it's not a Racing head... and it sucks...

rat · Post by **rat** » Tue Apr 22, 2008 6:04 pm

i got two R's then

Riekert · Post by **Riekert** » Tue Apr 22, 2008 7:50 pm

Well It's still not an RB!!

rat · Post by **rat** » Tue Apr 22, 2008 9:30 pm

Riekert · Post by **Riekert** » Tue Apr 22, 2008 10:11 pm

rat wrote:

Dont be sad! the CA is still a awesome motor!! Lots of fun to be had, then when you break it you by a SR or RB hehe!

veecee · Post by **veecee** » Tue Apr 22, 2008 10:56 pm

Riekert wrote:
rat wrote:
Dont be sad! the CA is still a awesome motor!! Lots of fun to be had,:twisted:

i lied to myself like that for many years!