Welcome to our BMW E30 based Marlin Sportster Build Site,
we hope you will find this documentation interesting and helpful.

The site has grown massively since its inception in 2005, I hope to one day soon improve the navigation as it's a bit overwhelming to start with. The main areas of interest to builders will be:
The rolling chassis build
Bodywork Fitting
SVA Issues
Final Assembly
If you would like read about the build in date order then have a look at his page.
It took 2.5 years to build the car and pass SVA and a lot longer to get to where it is now! To see the Sportster out on the road have a look at one of the videos here.
During 2008 we rebuilt the BMW engine from 2.5 to a 2.8 creating an M20B28 stroker engine. It uses the crankshaft from the later BMW M52B28 and the conrods from the M20B20. Not much more work is needed other than a clean up, slotting those bits together and a crank spacer. To read about the engine build click here (very picture heavy!)
Finally in March 2009 it was painted, a full set of images is here.
To read the whole build from the start click here.
03/06/2007
A little bit more progress!

Rubber is place round the rear wings - good tip for putting holes in the rubber. Use a socket piece that's the size hole you want to use. Place it on the rubber, put in a vice. Close it up quite tight and pull the rubber of the socket bit. Now you have a nice hole in the rubber!

Exhaust is now higher up and the reverse, fog and number plate lights are wired up and working!

And the first pictures to go into the interior gallery:
First custom piece on the interior taking shape

...can you guess what it is yet?

One finished indicator stalk!


And now in the car:

The indicator stalk as been modified so that it sits further forward to clear the dash This was achieved by bend it straight then putting a new bend in further towards the end of the stalk. The original plastic piece would not fit, but this turn out much nicer than the original anyway!

02/06/2007
meh
Anyway spent a little time finishing off bolting the tub up to the suspension towers - stop things flapping about.
Also set-up the up the front camber. No idea what to use so I've got 1.25 negative on both sides. The main thing is that they are now the same. Also made everything SVA friendly with those black tube things.
27/05/2007
Tank, and more small things
Today we fixed the tank which we found another leak in! After much head scratching Richard spent some more time practising a bit of ali welding - really not as easy as you might think. However the tank only need a blob on an existing weld to fix it. So we gave it a go (after a very good cleaning and a stand overnight)
Here's the problem:

And here's the fix:

Took two goes, first time there was a tiny amount still coming out second time round nice an sealed up!
Also spent time adding nice covers to the wiring for the head lights:



As tub has to come off to take the tank out and seal it up we spend some more time on this cleaning and adding more bolts to hold it on. Also added some sponge under here to reduce any rattles.

The other project that's been knocking about for a bit is the glove box. Would have wanted to weld this but it's just not a viable option for beginners without any training! So we riveted it instead, just don't look to closely as its not really straight ;o) But a bit of material to cover it up and that will hide the imperfections! The glove box will house the fuse box - needs a bit more tweak before it's 100%.

Also spend more time zip-tying wiring in the engine bay and adding extra support. Added one extra P clip to the fuel lines. There was one part where the distance between clips was 35cm - I think I read somewhere it needs to be every 30 at least for SVA - not sure if that right but better too many than too few!
26/05/2007
Gear Stick / Shifter Parts
21/05/2007
A few small things

The rings are a bit bright for normal rear lights so I think those will need dimming - a pair of rings wired in series should do the trick! Or it needs brighter bulbs in the red centres. Needs a bit of experimenting.
Also fitted two stainless hose clips on the steering rack to limit the movement to avoid damaging the brake lines - was an easy task. Take off the rubber boots put the hose clips in place and bolt down tight!
21/05/2007
More small things
Did a bit more tonight - put some more P clips in on the brake lines at the front of the car and zip ties where I couldn't get P clips in. Also zip ties all the electrical cable around the bottom of the engine bay. Finished off by trimming back the scuttle above the gauges so the fit in properly!
18/05/2007
Exhaust Version 2.0 Video
Download a video of the reworked exhaust Xvid / MP3 encoded (6Mb)
With it running the in garage you don't have to shout at people you want to at talk to any more, it's still suitably fruity but not just crazy loud!
17/05/2007
Exhaust Version 2.0

Only clamps left in the rear of the system. Decided to double clamp these ones to avoid any leaking.

Here it is from the back, left had side still has space for the secondary clamp, driver side will need a modified one round the muffler.

Short video to follow!
16/05/2007
Muffled

Extra Jetex micro mufflers welded on - the bend has been welded as well.

Richard's welds are starting to get good, it was almost a shame to grind down the metal!

13/05/2007
Lots of little things

Fog and reverse lights attached - these are just for SVA, the round ones will go on afterwards!

Bonnet clearance - just fits!

Under bonnet scuttle panels cut to shape and bolted in place.

Driver side scuttle cover - single hole for battery cable.

Passenger side panel with the same configuration as the driver side.

Modified Marlin headlight mounts - hole is milled out for the SVC headlights that have a larger diameter mount. The reason for milling rather than drilling was to move the hole back a bit - the damper mounting bolt gets the way otherwise!

Final dash wiring in progress - this is a clean up and tie down of everything.

