building a lovely NA 325 m20

Discuss general engine, turbo and supercharger conversions in this section

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timsands
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Post Sun Sep 27, 2009 12:23 am

going to build a nice 325 engine up and wondered what would be the best parts and techniques for this.

thinking of:

cam, zaust manifold, chip, fuel pressure reg, lightened flywheel.

any thoughts, want a powerful high revving na engine
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leeparkes
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Post Sun Sep 27, 2009 12:28 am

Stroke it to a 2.8
Cypriotgeeza wrote:I done both my mates in my old 318is
felt so proud,even tried it with a E30 325i and got put in my place.. :o:
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steve_k
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Post Sun Sep 27, 2009 12:30 am

leeparkes wrote:Stroke it to a 2.8
+1 then do everything else on your list :D
if it's got t*ts or wheels it's bound to be trouble...............prove me wrong.
getting oral sex off an ugly person is like rock climbing.....don't look down ;)
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leeparkes
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Post Sun Sep 27, 2009 12:35 am

here's one build thread

http://www.e30zone.net/modules.php?name ... sc&start=0

Or for less money throw an M50/M30 in there
Cypriotgeeza wrote:I done both my mates in my old 318is
felt so proud,even tried it with a E30 325i and got put in my place.. :o:
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goosiegander
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Post Sun Sep 27, 2009 1:23 am

2.8 M20 ftw! :D
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chu346
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Post Sun Sep 27, 2009 12:54 pm

goosiegander wrote:2.8 M20 ftw! :D
:gay:



Turbo :twisted:
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GeoffBob
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Post Sun Sep 27, 2009 4:28 pm

timsands wrote:going to build a nice 325 engine up and wondered what would be the best parts and techniques for this.

thinking of:

cam, zaust manifold, chip, fuel pressure reg, lightened flywheel.

any thoughts, want a powerful high revving na engine
Simply follow the "Step-by-Step guide to Engine Blueprinting" by Rick Voegelin, published by Cartech (see http://www.cartechbooks.com) for pratical methods to increase performance of N/A engines for both road and race applications.

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Nothing wrong with a good N/A engine, and well worth doing it properly.
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"It is amazing how many drivers, even at the Formula-1 level, think that brakes are for slowing the car down." - Mario Andretti
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chu346
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Post Sun Sep 27, 2009 5:22 pm

GeoffBob wrote:Nothing wrong with a good N/A engine, and well worth doing it properly.
For the cost you might aswell go turbo.
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e301988325i
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Post Sun Sep 27, 2009 9:17 pm

timsands wrote: want a powerful high revving na engine
uprated rockers!
I said:

Can anyone suggest how to test if the boot lights are staying on with the boot shut?

e30topless said:

lock the wife in there
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nickso
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Post Sun Sep 27, 2009 9:30 pm

e301988325i wrote:
timsands wrote: want a powerful high revving na engine
uprated rockers!
anyone tried the newman cams rockers? they seem good value but im not sure whats "uprated" about them.
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'88 e30 328i M52 track bint.
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BadDave
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Post Sun Sep 27, 2009 9:32 pm

chu346 wrote:
goosiegander wrote:2.8 M20 ftw! :D
:gay:



Turbo :twisted:
2.8 M20 with a turbo winkeye
Alpina B10 3.2L #187 (1 of 64 brought into the UK)
2.8L turbo build thread(work in progress)
http://www.e30zone.net/modules.php?name ... 27#1268227
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e301988325i
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Post Sun Sep 27, 2009 9:37 pm

ebay item number 270215187635 £OUCH
I said:

Can anyone suggest how to test if the boot lights are staying on with the boot shut?

e30topless said:

lock the wife in there
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BadDave
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Post Sun Sep 27, 2009 9:51 pm

e301988325i wrote:ebay item number 270215187635 £OUCH
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 3D1&_rdc=1


Looks like we'll have to enquire at Newman's to see what their rockers are good too. Especially as there less than 1/4 of that price.
Alpina B10 3.2L #187 (1 of 64 brought into the UK)
2.8L turbo build thread(work in progress)
http://www.e30zone.net/modules.php?name ... 27#1268227
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Jhonno
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Post Sun Sep 27, 2009 10:04 pm

24v swap is the best way round your rocker issues.. :)
Got cable ties? Get diffin..

Arch roller for hire.

www.zeroexhausts.co.uk

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Simon13
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Post Sun Sep 27, 2009 10:37 pm

true, forget the pressure regulator you won't need it.

Some lighter conrods from the bmw parts bin, M50,M52. FLywheel, maybe some lighter slugs?

2.5's can really rev with a cam and lighter flywheel. They're a bit lethargic with the stock cam
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e21Jason
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Post Sun Sep 27, 2009 11:31 pm

the

newman rockers are steel not alloy and I am not sure how many sets the have as 2 years I got a deal from them for all there remaining stock of m20 rockers

jason
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ross_jsy
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Post Mon Sep 28, 2009 4:26 am

itb's?
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toby
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Post Mon Sep 28, 2009 9:58 am

Skim the head to raise compression ratio.
Start off with the higher compression pistons.
Cam and complementary chip would make it revvy- even this bit costs a fair bit to do thoroughly.

Did you have a budget in mind?

I have a tech 1 flywheel if you are interested.
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E30BeemerLad
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Post Mon Sep 28, 2009 2:31 pm

For what you have planned for the M20 donk, by the time you have finished with all of this, you'll be about 3 grand lighter.

Unless you are a M20 bufty and all up for originality or just want the challenge of rebuilding an engine yourself, it is difficult to look past doing a 24V swap as a more cost effective means of getting better power.
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Simon13
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Post Tue Sep 29, 2009 10:42 pm

skimming heads to raise the CR isn't a good idea if your fitting a high lift cam imo. I don't think its a good idea at all personally
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