DaveK Posted March 29, 2002 Share Posted March 29, 2002 Dave First thing to list is what can you keep from your existing engine that will be suitable for 240bhp. Don,t be led into buying things that aren't necessary. Minimum you require will be Pistons to up compression to approx 11:1 Cams to suit (Qed 450 cams will give up to 250bhp although there are other cams that will suit the above are first to mind.) Steel rods (for safety as much as anything.) gas flowed head (use std size valves although waisted stem.) double valve springs and solid tappets would also be advisable. What management system do you have? if its the Mbe 912 series then you could just get the later ecu pre 941 series which is plug compatible and fuel /ign mappable,this ecu however has been superceded so is now getting difficult to find. Dta system is going to cost 845+vat for ecu/loom, john noble can map dta . The main objective of the rebuild though should be to cure the excessive oil consumption. The steel oil pump gears and a std vx prv provide adequate oil pressure even on a tuned engine Good luck Dave Link to comment Share on other sites More sharing options...
EFA Posted March 30, 2002 Share Posted March 30, 2002 And just to contradict Dave I'll add my comments: Minimum you require will be Pistons to up compression to approx 11:1 - 11.8:1 is achievable with std pistons and a lightly skimmed head. Cams to suit (Qed 450 cams will give up to 250bhp although there are other cams that will suit the above are first to mind.) - Swindon p02/p11 are the best combination Steel rods (for safety as much as anything.) - Agreed - get the lightest you can. gas flowed head (use std size valves although waisted stem.) - No need to waist stems. Double valve springs and solid tappets would also be advisable. - Convert the hydraulic tappets with shims - this will be fine to 8500rpm. Double springs are pretty essential as are titanium spring retainers/ What management system do you have? if its the Mbe 912 series then you could just get the later ecu pre 941 series which is plug compatible and fuel /ign mappable,this ecu however has been superceded so is now getting difficult to find. You can get a conversion cable for 912 to 941/967 from GWR Motorsport. If you ring Jerry at MBE and grovel, he'll sell you a 956 which is the plug compatible ECU for the older 912. Dta system is going to cost 845+vat for ecu/loom, john noble can map dta . The main objective of the rebuild though should be to cure the excessive oil consumption. The steel oil pump gears and a std vx prv provide adequate oil pressure even on a tuned engine Whats a std "prv" Dave? Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
EFA Posted March 30, 2002 Share Posted March 30, 2002 Oh and iof you have a 912 ECU and go for the Swindon cams and get the head ported to Swindon 235 spec (carbs) with Jenvey Taper TB's - I have a 912 map on an eprom you can have for free! With the tb's this setup gives around 250bhp. Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
DaveK Posted March 30, 2002 Share Posted March 30, 2002 Arnie Prv = pressure relief valve Dave Link to comment Share on other sites More sharing options...
EFA Posted March 30, 2002 Share Posted March 30, 2002 Ah.... Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
NickD Posted March 31, 2002 Share Posted March 31, 2002 Aves - the prv I used was a Swindon one (orange plastic, don't know if it is the same as the SBD one). Arnie - Arrow rods are nice but who ever used them in a Touring Car? They are still probably the best available to fit a Std crank. Link to comment Share on other sites More sharing options...
EFA Posted March 31, 2002 Share Posted March 31, 2002 Nick, ASAIK the T/C engines used rods made by Arrow for Swindon. See the opening para at http://www.arrowprecision.co.uk/ Do you know something I don't??? Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Edited by - Fat Arnie on 31 Mar 2002 19:54:30 Link to comment Share on other sites More sharing options...
NickD Posted March 31, 2002 Share Posted March 31, 2002 Arnie, Swindon use Carrillo rods. The Arrow ones must be fitted to some other car. Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted April 1, 2002 Share Posted April 1, 2002 I thought Swindon used Arrow rods as well. I bought a set direct from Arrows and they certainly looked the part. They did give a small discount for our bulk buy of 3 sets. Arnie, I'm still wondering if I have the right big end bearings..... Mine were the dull ones, not the shiny ones and were a GM part. Does that mean anything? Alex Link to comment Share on other sites More sharing options...
EFA Posted April 1, 2002 Share Posted April 1, 2002 ALex, Dull is good. You have the corretc bearings. The shiny ones are OK for the mains. Do you know if you ahve the narrow or wide version?? (not a failure issue though) You would know by now if you had the wrong material type bearings. A few dips into 8000rpm+ territory and the signs will become evident - a few dips beyond 8500 and it'll start rattling! Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Edited by - fat arnie on 1 Apr 2002 18:07:59 Link to comment Share on other sites More sharing options...
captain chaos Posted April 1, 2002 Share Posted April 1, 2002 I have Dull big ends and shiny mains (apart from one!) how much is a complete set of bearings and is it best to change them completely if taken out, whatever their condition? Link to comment Share on other sites More sharing options...
EFA Posted April 1, 2002 Share Posted April 1, 2002 Gary, A complete set is around £160 - more if you need undersize. Buy the big ends from Swindon - they are the onmly reliable source of the dull ones (to the extent that they had GM restart production to make a Swindon exclusive stockpile. Fat Arn Visit the K2 RUM siteid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
captain chaos Posted April 1, 2002 Share Posted April 1, 2002 Thanks Arnie, I'm sure it's the swindon ones in there, what about reusing them? the big ends have only done 600 miles! Link to comment Share on other sites More sharing options...
I reply to every thread Posted April 2, 2002 Share Posted April 2, 2002 Mine had done 73,000 & we reused them!!!!!!!!!!!! Link to comment Share on other sites More sharing options...
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