https://www.r3vlimited.com/board/ en Sat, 06 Jun 2026 22:09:00 GMT vBulletin 60 https://www.r3vlimited.com/board/images/misc/R3V.jpg https://www.r3vlimited.com/board/ https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10162240-s54-stock-headers-on-m20 Sat, 06 Jun 2026 16:32:25 GMT
M20 exhaust port ramp is more upward facing, s54 has a flatter exit.

Won't fit at all with b25 oil cooler setup. Would require a short filter b27 mount style or oil filter relocation.

Couldn't find any info on it so I wanted to take a few photos while I had a set on hand.

Engine block tab hit the front most head flange so I couldn't get the front flat. This orientation was the closest fit.

Untitled by bimmertown, on Flickr

Untitled by bimmertown, on Flickr
Untitled by bimmertown, on Flickr


]]> M20 AWDBOB https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10162240-s54-stock-headers-on-m20 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10162151-has-this-885-head-had-3-angle-valve-seats-cut Fri, 05 Jun 2026 10:56:48 GMT Put my 885 head in to get new exhaust valve guides and 3 angle valve seats cut. After picking it up I’ve found 3 of the intake valve sealing faces to be concave, and all the intake valve seats have grooves round them. Spoke to them and they say their cutter is a bit worn (think they use a Serdi), and are going to get a new one and recut them. I can’t see 3 angles on the valve seats, it just looks like one big angle to me? May be wrong as I have nothing to compare to.
After picking it up I’ve found 3 of the intake valve sealing faces to be concave, and all the intake valve seats have grooves round them.

Spoke to them and they say their cutter is a bit worn (think they use a Serdi), and are going to get a new one and recut them.

I can’t see 3 angles on the valve seats, it just looks like one big angle to me? May be wrong as I have nothing to compare to.
]]> M20 14thirty https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10162151-has-this-885-head-had-3-angle-valve-seats-cut https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161907-m20-super-rich-help Tue, 02 Jun 2026 02:05:20 GMT Hi, my winter project was renewing a 90 325 I cab. I deleted the cat, replaced the O2 sensor, replaced the original injectors with 19lb 4 pintle Ford 5.0 style, in anticipation of adding a Conforti chip soon. Starting it up, it is full rich, like the regulator is doing nothing. Fuel pressure out the return is 70-90 lbs! I ohmed the temp sensor, replaced the regulator, have good vacuum to the regulator…is my ecm not happy with the changes? Any feedback is appreciated Hi, my winter project was renewing a 90 325 I cab. I deleted the cat, replaced the O2 sensor, replaced the original injectors with 19lb 4 pintle Ford 5.0 style, in anticipation of adding a Conforti chip soon. Starting it up, it is full rich, like the regulator is doing nothing. Fuel pressure out the return is 70-90 lbs! I ohmed the temp sensor, replaced the regulator, have good vacuum to the regulator…is my ecm not happy with the changes? Any feedback is appreciated M20 Natman61 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161907-m20-super-rich-help https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161441-waterpump-recommend Sat, 23 May 2026 14:01:33 GMT
i notice graf is available, they used to have a decent reputation. bmw brand is available but i'd like to duck the oem tax if possible.

if the pump doesn't fix it the last thing left is the radiator. ]]> M20 82eye https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161441-waterpump-recommend https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161439-m20-ix-getrag-vs-i-getrag Sat, 23 May 2026 12:33:46 GMT Looks like output shaft on IX and i are the same part number with IX being 23211224294 and realOEM say it's interchangeable/ superseded by 23211228297 which is a a part number for i Getrag. So basically i output flange should bolt up to IX Getrag
]]> M20 zaq123 https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161439-m20-ix-getrag-vs-i-getrag https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161236-m20-stroker-turbo-piston-cam-and-compression-ratio-choice Mon, 18 May 2026 14:27:56 GMT At minimum it needs a rebore and pistons due to ring land failure on #5 + #6, which has damaged the bores a bit.


Looking a fitting a longer throw crank, I’ve read about the M52B28 crank, 130mm rods, stock 8.8:1 pistons, 0.5mm off the block combo.
Are stock 8.8:1 oversize pistons still available anywhere? They seem to be no longer available from BMW.


If I have to go with custom pistons, am I as well using an M54B30 crank?


Want to fit a better cam, is a Schrick 288 suitable for a 2.8 or 3.0 M20 with a turbo, or are there better options?
Head is currently getting guides replaced and 3 angle seats cut, otherwise stock head. Using 885 head, HX35 (16cm split housing) on kangaroo manifold.

Are there off the shelf forged pistons that would work with the M54 crank and a 288 Schrick? Not sure if it costs more to give them a spec or use one they already have. I want the correct dome for the 885 head.

Also not sure what compression ratio to choose if I have custom pistons, I realise it has to be suitable for the cam, though I'm not sure how a turbo affects this.
Fuel is UK 98 (US 93), running 50/50 water/meth into the charge pipe.

Thanks
]]> M20 14thirty https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/m20/10161236-m20-stroker-turbo-piston-cam-and-compression-ratio-choice