We have detected you're not on the correct site for the car you have selected! Click the green button below to go to the correct site.
Select your car: 
BMW Mini Cooper
Select
 

 Engine size

 Created by: croc7
   Forum Width:     Forum Type: 

 Posted: Apr 30, 2020 05:26AM
Total posts: 4134
Last post: Oct 13, 2020
Member since:Oct 8, 2011
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
US
I think I have heard them reffered to as 1050s. I have been building a few and they make a nice unit.
I use an A+ block and the late 998 press fit rods and flat to 10 to 1 pistons. Bore , clean , hone , deck
, cam bearings and freeze plugs. Grind or polish the crank and balance the complete assembly. I use
two part Cooper balancer and light flywheel and back plate. If using a 940 cyl head I relieve the block for
exhaust valves and drill and tap for extra studs. As long as I can get them I prefer to use the Cooper/
1100 295 cyl head castings. I use cast valve guides, hard exhaust seats, O/S late lead free triple groove
intake and exhaust valves. Head needs to be CC ed and a pretty good wack surfaced to reach 10.2 to 1.
I built one for a customer and used the Swift SW5 cam. The next one I build will get a Kent 266.

I have to use four different machine shops to get all my machine work done. The only shop who bores
small bore is an hour drive each way. The last 998 I did I ordered two sets of pistons and a couple of
sets of press rods. I had two blocks roughed out. I also had a second 295 cyl head done at same time.
All it needs is honing to finish size, balance and order a cam.

If someone needs nice 998 for a summer project let me know. Steve (CTR)

 Posted: Apr 29, 2020 09:43PM
Total posts: 3506
Last post: May 12, 2021
Member since:Feb 26, 1999
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
US
Quote:
Originally Posted by croc7
What is the displacement of a 998 bored .060” over?
bore 2.543 standard stroke 76.2mm at +0.060" would give you 1046

 Posted: Apr 29, 2020 08:20PM
Total posts: 823
Last post: May 5, 2021
Member since:Aug 15, 2002
Cars in Garage: 0
Photos: 0
WorkBench Posts: 0
US
What is the displacement of a 998 bored .060” over?