Series 1 central vs left side exhaust exit

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PV-ALPINA
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Series 1 central vs left side exhaust exit

Post by PV-ALPINA »

When was it changed from left side exhaust exit to central exhaust exit on series 1 E24?
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

On my 81 Euro left side
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
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Re: Series 1 central vs left side exhaust exit

Post by PV-ALPINA »

bpoliakoff wrote: Mon Sep 28, 2020 5:21 pm On my 81 Euro left side
What, I just thought I found it on realoem that there was a change 09/79. Are you sure you have the original rear bumper? Do you have 2 or three silencer? Do you have a mid part support for the exhaust system. Left side exhaust exit as far as I have learnt has two silencer and central exhaust exit 3 silencer. And yes I am referring to Euro model.
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

I don't have an original exhaust system but that is neither here nor there. The valance is very clearly made( stamped) for left exhaust not center and it looks great that way. I am running a Billy Boat system. Two separate resonators into one muffler and 2 pipes out 2" from manifold through resonators to muffler and out, the tips are 2.5" diagonally sliced

As to the rear bumper, it is original as it is the short sides not the wrap around as on the later chassis cars. My car was basically all there when I bought and hadn't been molested
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
PV-ALPINA
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Re: Series 1 central vs left side exhaust exit

Post by PV-ALPINA »

bpoliakoff wrote: Mon Sep 28, 2020 8:05 pm I don't have an original exhaust system but that is neither here nor there. The valance is very clearly made( stamped) for left exhaust not center and it looks great that way. I am running a Billy Boat system. Two separate resonators into one muffler and 2 pipes out 2" from manifold through resonators to muffler and out, the tips are 2.5" diagonally sliced

As to the rear bumper, it is original as it is the short sides not the wrap around as on the later chassis cars. My car was basically all there when I bought and hadn't been molested
Ok, the question is when series 1 E24 with short rear bumper got the central exhaust exit?
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

Well, my car is a May of 81 build if that helps
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
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Re: Series 1 central vs left side exhaust exit

Post by mopar »

My car is a Series 1 1980 build oktober and has a central exhaust.
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Re: Series 1 central vs left side exhaust exit

Post by Pod »

This got me thinking, so I went out to look at my E24s.

The earliest one I currently own is a late S1 (02/82). This has the exhaust cut-out just to the left -about 1"- of the centre line. In that I mean the nearest-to-centre edge of the cut-out is located there. All my other cars have the cut-out about 1" to the right of the centre line. So none actually centred, but not "way off" to the left or right either!
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Re: Series 1 central vs left side exhaust exit

Post by olympia57 »

Boot ( trunk ) floor with spare wheel and petrol tank would prevent it being routed other than centre.
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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

I thought all Euro series one 635s and 633s got the left of center exhaust. With the pipes actually pointing to left.

Just as a curious note, Pod, how many e24s do you have and which ones? I'd be interested to see pics. Maybe a different post? Sorry to infringe on this post :oops:
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

zinnocoupe wrote: Mon Nov 30, 2020 7:32 pm I thought all Euro series one 635s and 633s got the left of center exhaust. With the pipes actually pointing to left. Just as a curious note, Pod, how many e24s do you have and which ones? I'd be interested to see pics. Maybe a different post? Sorry to infringe on this post :oops:
++1
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Re: Series 1 central vs left side exhaust exit

Post by Pasocb »

I am not going to admit how many series-one cars we currently have at our family shop. However, I can confirm that the Euro cars have their exhaust tips shifted left of center and US cars have them centered. Both US car and Euro car exhaust tips are pointed straight back in their original form.
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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

Its not real obvious but these exhaust tips point to the left by quite a bit. My 79 Euro has this and I just installed the same exhaust in my NA 530i

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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

I just found on Realoem that the series 1 cars used the left exiting rear muffler till 05/82

https://www.realoem.com/bmw/enUS/showpa ... Id=18_0115
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Re: Series 1 central vs left side exhaust exit

Post by olympia57 »

olympia57 wrote: Sat Nov 07, 2020 7:54 pm Boot ( trunk ) floor with spare wheel and petrol tank would prevent it being routed other than centre.
I stand corrected .... :oops:
My S1 exhaust does sweep to the left upon exit from the silencer .
DSCF7680 (2).JPG
DSCF7680 (2).JPG (470.32 KiB) Viewed 8315 times
1981 635 series 1
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

I don't have my car close by for a picture, my euro is cut noticeably left of center. i have a Billy Boat exhaust system and the tail pipes sweep very very far left and look major neat. Unfortunately the system is out of the car and the car isn't close by so no pics.
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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

olympia57 wrote: Tue Dec 01, 2020 9:36 am
olympia57 wrote: Sat Nov 07, 2020 7:54 pm Boot ( trunk ) floor with spare wheel and petrol tank would prevent it being routed other than centre.
I stand corrected .... :oops:
My S1 exhaust does sweep to the left upon exit from the silencer .
DSCF7680 (2).JPG
Don, Your car looks very very nice from the back. It looks brand new. =D> Is that an OEM exhaust or aftermarket? As I said above I was thinking that all Series one cars had the exhaust ends that swept to the left. I mean to say the tips actually point to the left.

Hows the swap coming along?
Last edited by zinnocoupe on Wed Dec 02, 2020 6:32 am, edited 2 times in total.
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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

bpoliakoff wrote: Tue Dec 01, 2020 11:16 pm I don't have my car close by for a picture, my euro is cut noticeably left of center. i have a Billy Boat exhaust system and the tail pipes sweep very very far left and look major neat. Unfortunately the system is out of the car and the car isn't close by so no pics.
Bert is this the exhaust you have? It doesn't look like it would put the tips in the right spot for a series 1 car?
https://www.bbexhaust.com/shop/bmw-e24- ... fbmw-0700/
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Re: Series 1 central vs left side exhaust exit

Post by olympia57 »

zinnocoupe wrote: Wed Dec 02, 2020 6:28 am
olympia57 wrote: Tue Dec 01, 2020 9:36 am
olympia57 wrote: Sat Nov 07, 2020 7:54 pm Boot ( trunk ) floor with spare wheel and petrol tank would prevent it being routed other than centre.
I stand corrected .... :oops:
My S1 exhaust does sweep to the left upon exit from the silencer .
DSCF7680 (2).JPG
Don, Your car looks very very nice from the back. It looks brand new. =D> Is that an OEM exhaust or aftermarket? As I said above I was thinking that all Series one cars had the exhaust ends that swept to the left. I mean to say the tips actually point to the left.

Hows the swap coming along?
Hi Dave
I had the exhaust off the car when I restored it . I cannot find a photo of it when off but there was a brand stamping on the silencers . One piece though so it's complete from front to rear .....
I do recall a substantial invoice for a new exhaust in the service history that came with the car so whether it was OE BMW or not it was fitted by the MD.
edit , found this .
DSCF7771 - Copy (4).JPG
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Re: Series 1 central vs left side exhaust exit

Post by zinnocoupe »

Don, Mmm ok thx for posting that. It doesn't look obviously aftermarket to me but it also doesn't have the roundel stamped in it. Not sure. Again, that car looks very nice and clean.
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Re: Series 1 central vs left side exhaust exit

Post by bpoliakoff »

Maybe you can judge by the relationship to the tow eye.
exhaust.JPG
exhaust.JPG (57.68 KiB) Viewed 8197 times
This on my 81 Euro.
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
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