wfarrell Posted December 8, 2003 Share Posted December 8, 2003 Honda Integra (old shape) B18C engine. Wonderful torquey sweet rev-rev-revving jewel of a lump. Shame about the exhaust/'box config :( --- www.TeamTool.co.uk --- Link to comment Share on other sites More sharing options...
Irrelevant Posted December 8, 2003 Share Posted December 8, 2003 Would the Richardson 306V fit a Cat - 60 degree V6 which has apparently produced up to 400bhp in testing....120kg before you ask.....and if you need to ask the next question then you can't afford it 😬 J351 TPE . . . battered old X/Flow Link to comment Share on other sites More sharing options...
Peter T Posted December 8, 2003 Author Share Posted December 8, 2003 This looks like the same engine that is used in the Palmer cars. Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
Joe 90 Posted December 8, 2003 Share Posted December 8, 2003 Well if you have a powerful high revving engine you will need a high final drive ratio for gearing. Drive shaft torque is prop shaft torque multiplied by final drive ratio, so I don't see how you can win that one. I realise you need a transmission and prop shaft to suit the engine, but that's not a limitation of the Caterham chassis. Various "experts" rate the power limit of the chassis at about 220BHP. I will be on the road by Christmas. Photos here Link to comment Share on other sites More sharing options...
elie boone Posted December 8, 2003 Share Posted December 8, 2003 Why not consider some Johnson or Envirude engine from an F1 Powerboat, i know they are two strokes so this may put you off but i think you will not find any lighter engine than those. Link to comment Share on other sites More sharing options...
EFA Posted December 8, 2003 Share Posted December 8, 2003 320bhp for £20k - ? Off the shelf at SRE. Fat Arn Visit the K2 RUM website See the Lotus Seven Club 4 Counties Area Website here Link to comment Share on other sites More sharing options...
JimB Posted December 9, 2003 Share Posted December 9, 2003 I am toying with the idea of costructing an engine for the 7 made out of a number of 0.8cc Cox model aeroplane engines. I reckon a V96 using a light alloy crankcase should give excellent balance and about 20bhp, on nitro. Therefore 10 of these engines geared together should be just the job. There would be the advantage of no spark plugs and ignition system (glow plugs used), a nice noise, and a distinctive smell. I havn't worked out the engine mounts yet, or what gearbox to use. Has anyone tried this, and what performance can I expect? Link to comment Share on other sites More sharing options...
Peter T Posted December 9, 2003 Author Share Posted December 9, 2003 Surely the fuel would be a problem, i don't know of any garages that stock Nitro 😳 And imagine connecting all those glow plugs to one battery to start it. Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
Joe 90 Posted December 10, 2003 Share Posted December 10, 2003 JimB, Sounds like you should try for a job at Honda I will be on the road by Christmas. Photos here Link to comment Share on other sites More sharing options...
Tight fart Posted December 10, 2003 Share Posted December 10, 2003 Various "experts" rate the power limit of the chassis at about 220BHP. Yes Oliver, just what I was thinking as I was being lapped in the Centurian races this year. T.F@O.F. A7 RDP Pics here Link to comment Share on other sites More sharing options...
Jason Plato Posted December 10, 2003 Share Posted December 10, 2003 Dunno where this 220bhp came from . The chassis *may* need some strengthening around the diff mountings - depending on year . But I would consider 300 bhp and 220 lb torque reasonable . All I wish for is 1000bhp/ton ☹️ Lotus 7 Club Speed Champion 2003 South Wales Area Organiser C7 TOP Link to comment Share on other sites More sharing options...
Irrelevant Posted December 10, 2003 Share Posted December 10, 2003 JimB: If you're going to use aviation engines, there may be some Olympus-593s going cheap. Would certainly give a good power to weight ratio in a Cat. You may be lucky and get a high mileage one for £20K. J351 TPE . . . battered old X/Flow Link to comment Share on other sites More sharing options...
Sheds Moderator Posted December 10, 2003 Share Posted December 10, 2003 Good thinking Jim, 2 strokes on 20% castor oil are the way forward. Emissions could be tricky. Still, rebuild in minutes, every weekend... If we are going 2stroke I think the RS250 Aprilia has potential, nice and compact, fantastic specific power, probably need to build a radial 16 2-litre at around 350bhp, crankcase design and overall height could be tricky. Or one of those marine 2str diesels, the ones that weigh several dozen tons and generate max power at 500 rpm, you can save weight by not needing a gearbox. Link to comment Share on other sites More sharing options...
Bob Corb Posted December 10, 2003 Share Posted December 10, 2003 For ultimate power I doubt you can't beat an 18 cylinder MAN B&W 2 stroke diesel, 140,000 BHP at 100rpm See here for the dinky 12 cylinder version:- http://www.manbw.com/web/engines/TwoStrokeLowSpeedPropEngines.asp?model=K90MC-C&cylinder=12 For ultimate power in a seven then its Cosworth KF V6, 2.5l, 500BHP at ~14000rpm. Ex Calibra DTM. They occasionally appear in Pilbeam Hillclimb cars and I've seen one at Swindons stand at autosport. De-tune it to 350BHP at 10,000rpm and you may just keep most of the wheels in contact with the ground. Cosworth are just about to launch a high performance version of the Duratec I4. It will probably be shown of at Autosport and then be sold in the Ford SVE parts catalogue mainly in the US. BC Link to comment Share on other sites More sharing options...
Peter T Posted December 10, 2003 Author Share Posted December 10, 2003 If i was going touse a Cosworth unit, then it would have to be a DFV,but as i stated i am looking for serious suggestions. Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
Irrelevant Posted December 10, 2003 Share Posted December 10, 2003 PeterT: The original owner of my car wanted to install a Cosworth DFV as he'd taken the BDG as far as it would go and wanted more power. He had the money and was prepared to spend it but the company who built and prepared his Cat talked him out of it becasue they were concerned the vibration would crack the chassis tubes. Are there any V8 Cats around? Hasn't anyone done a V8 SV yet? J351 TPE . . . battered old X/Flow Link to comment Share on other sites More sharing options...
Bill Shurvinton Posted December 10, 2003 Share Posted December 10, 2003 Oddly enough, since this thread started I had a chat with my engine builder and we have kicked off building an 'interesting' engine. Basically half an RX7 block with a turbo on the side. Should produce a minimum of 300HP at 10,000RPM. Engine itself will be cheap to build (very few moving parts), but finding a light and affordable gearbox and diff to couple to it could be a challenge. May need a smaller car to put it in as as it would get lost in a se7en being less than a foot long. Link to comment Share on other sites More sharing options...
Tight fart Posted December 10, 2003 Share Posted December 10, 2003 Given the mileage that most of us do (I know some of you have been around the world several times and to the moon and back) but a rotary must be the best answer. Or a 2stroke snowmobile engine. T.F@O.F. A7 RDP Pics here Link to comment Share on other sites More sharing options...
Peter T Posted December 10, 2003 Author Share Posted December 10, 2003 Adam, as far as i know there is no V8 sevens, but plenty of imitations with V8 power Rumours are that a partnership with caterham and a new motorbike derived V8 powerplant is on the cards, which will only fit an SV. 🤔 Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
dino ferrana Posted December 10, 2003 Share Posted December 10, 2003 I am sure one of the Chris Rees books has a 7 with a V8 in it. The piccy is years old as well. Link to comment Share on other sites More sharing options...
Peter T Posted December 10, 2003 Author Share Posted December 10, 2003 are you sure dino, i will have to check my library tonight Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
Irrelevant Posted December 10, 2003 Share Posted December 10, 2003 I thought someone had a V8 in a heavily modded Cat. He had the engine/box sandwiched around a new bulkhead and the whole front end used the engine as a stressed member for the suspension subframe. Don't remember where I saw it though. It was ages ago I read about it - before I was into 7s, so I may be mistaken. J351 TPE . . . battered old X/Flow Link to comment Share on other sites More sharing options...
rgrigsby Posted December 10, 2003 Share Posted December 10, 2003 Peter T you may want to have a chat with Chris at the 7's workshop about those bike V8 in an SV rumours.. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Peter T Posted December 10, 2003 Author Share Posted December 10, 2003 Mmmmm, might well do that Founder Member of The Twisted Prop Club. Link to comment Share on other sites More sharing options...
Anthony Posted December 10, 2003 Share Posted December 10, 2003 Pete, better still pop in and check-out the photos - fantastic ! Anthony Engine in, oil lines in, now where's the hacksaw to cut the secondaries... Link to comment Share on other sites More sharing options...
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