stutch Posted May 10, 2002 Share Posted May 10, 2002 As my tacho has no redline indication could someone give me an indication of the RPM it'll rev to regularly without enticing the pistons out of the block? (1700 SS - claimed 135BHP etc). Link to comment Share on other sites More sharing options...
Eugene Posted May 10, 2002 Share Posted May 10, 2002 I always limited to 6,800 for normal use, with the odd blip to 7,200. HOWEVER, mine was well balanced... Best talk to Roger King at Roger King Engines (www.rogerkingengines.com) Small Boy - with Loud Toy! See Eugene here and Lotus@Herts hereid=green> Link to comment Share on other sites More sharing options...
EFA Posted May 10, 2002 Share Posted May 10, 2002 Std 1700 Supersprint is 6500rpm. 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...
Eugene Posted May 10, 2002 Share Posted May 10, 2002 Nah, never had it that low, except tickover maybe. Think you must be thinking of Vauxhall engines... Small Boy - with Loud Toy! See Eugene here and Lotus@Herts hereid=green> Link to comment Share on other sites More sharing options...
ashaughnessy Posted May 12, 2002 Share Posted May 12, 2002 How does it feel after about 6300rpm? Does it feel a bit rough? I think the Caterham spec supersprint engine gives maximum power about 6200 rpm (can anyone confirm this?) in which case it isn't really worth going about 6500. Have you ever had it on a rolling road? If so, do you have a graph of power vs engine speed? It would be interesting to work out the engine speeds in each gear as you change up. As long as your change up point doesn't make the engine speed drop below 3500rpm in the next higher gear then you'll be OK, because the supersprint has plenty of torque from 3500. I've always kept mine to a red-line of 6000 unless I'm being a hooligan. Even then, I won't go above 6200. This is partly to prolong engine life, though. After 6200, it sounds rough and I don't think it's happy to go faster. I'd definitely second the comment above about asking Roger King. He might be along in a minute to chip in himself. Anthony PS another engine builder I spoke to recently, when I told him what revs I typically use, told me I was driving like a granny! Edited by - ashaughnessy on 12 May 2002 21:01:03 Link to comment Share on other sites More sharing options...
Leadership Team Midas Posted May 14, 2002 Leadership Team Share Posted May 14, 2002 I run a 1700 SS, with an engine built in 1992 to a higher spec than the Caterham engine, and it is balanced. My engine still has standard Supersprint pistons, and it is these that are the 'weakest link'. Roger King's advice to me recently was to red line at 6000 rpm. Any more than this and you risk an expensive and spectacular accident. If you want your engine to rev higher Roger suggests rebuilding with forged pistons Link to comment Share on other sites More sharing options...
Eugene Posted May 15, 2002 Share Posted May 15, 2002 Yep, I had (and have) forged pistons and fully balanced. There is a power curve graph on my website but its for the 1700 Twink I now use (Vegantune). Its interesting as the power is still rising at the cutoff point... Small Boy - with Loud Toy! See Eugene here and Lotus@Herts hereid=green> Link to comment Share on other sites More sharing options...
ashaughnessy Posted May 15, 2002 Share Posted May 15, 2002 This is interesting to me at the moment as I am just having my xflow rebuilt with forged pistons. However, apart from the pistons, the rebuild will be to the same spec, i.e. same cam, same valves, same head, etc. With a 234 cam then peak power might be around 6000 to 6200 rpm, and there is plenty of torque from about 3500 rpm, and I have a four speed box. SO - is there any advantage to be able to use higher revs once I've got forged pistons (and possibly some other small uprates like better con-rod bolts and steel rocker post, etc) ? If peak power is still at the same place and the torque curve is the same, would I go faster by using a higher redline? Anthony Link to comment Share on other sites More sharing options...
Graham Sewell Posted May 15, 2002 Share Posted May 15, 2002 I asked the factory this question a year or so ago and got the following reply: Following a unprecedented debate within in the engine shop as to the actual limit, the desirable limit, the max power limit, the durability limit, etc, etc, a figure of 7000rpm has been agreed. I hope this information is of use to you and should you have any further queries please do not hesitate to contact me. Regards SIMON LAMBERT Aftersales Manager --- However, as I wish to keep my engine intact I have set my rev limited at about 6700 to allow a greater margin of safety. Cheers, Graham Low tech luddite - xflow and proud! Link to comment Share on other sites More sharing options...
JKJ Posted May 18, 2002 Share Posted May 18, 2002 Good God no, 6000rpm max. Link to comment Share on other sites More sharing options...
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