What cams to upgrade to in a big valve - LotusTalk - The Lotus Cars Community
 
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post #1 of 7 (permalink) Old 04-27-2015, 11:08 AM Thread Starter
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What cams to upgrade to in a big valve

To introduce myself, I am restoring a production racing Europa but am after some advice on upgrading the engine as I have now got round to working on it. I want a tractable engine on mildish tune so I recon I'm after about 150.bhp.
I have the head being rebuilt and gas flowed and my engine tuner suggests piper 270 camshafts to replace the std big valve sprint cams and recons that that will produce a good tractable motor with the gas flowed head. I will be upgrading the bid end bolts and keeping the std 40mm dellortos.
I am just after advice from others, if this is the right upgrade? Or ny other views. Comments definitely welcome.

Thanks

Dave
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post #2 of 7 (permalink) Old 04-27-2015, 01:29 PM
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Dave,

I'd strongly recommend that you join Lotuselan.net for the world of expertise there.

Another route would be cams from John at Omnitech to whatever spec he recommends.

Omnitech - Tooling Design, Lotus TwinCam & Stromberg Weber Conversion

Do you have square big end caps?

1969 Elan Plus 2
1990 Esprit Turbo SE
1986 Porsche 911
1982 Esprit Turbo SOLD
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post #3 of 7 (permalink) Old 04-27-2015, 01:32 PM
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Oops, hit the button too quick.

I think quite a lot of people go with the QED420 cams

Lotus Twin Cam | Q420 camshaft, various types | QED Motorsport | Cam,

1969 Elan Plus 2
1990 Esprit Turbo SE
1986 Porsche 911
1982 Esprit Turbo SOLD
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post #4 of 7 (permalink) Old 04-27-2015, 02:19 PM
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The QED cams are quite good.

I had a used engine build by them at it was very, very good.

OP, you need to get the Miles Wilkins book, the definitive volume on Twin Cams.

Really worth it.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #5 of 7 (permalink) Old 04-28-2015, 05:11 AM
CLW
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Paeco has a good reputation. ENGINES
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post #6 of 7 (permalink) Old 04-29-2015, 08:37 AM Thread Starter
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Cheers guys, the QED 420 does look a decent cam, not too wild, I will be doing a bit more digging I think on people's views. I have got the miles wilkins book, bed time reading.
Will feed back where I have got up to.

Dave
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post #7 of 7 (permalink) Old 04-29-2015, 06:42 PM
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bump on the comment for lotuselan.net. Check posts by Rohan.
bump on the comment about John at Omnitech as well.

On my twink I went with 10.5:1 pistons, and cams reground by D. Elgin at 290 duration and 430 lift. The head is ported and I am using a Dave Bean long secondary tube header. On pump gas, 80 degree day in Denver (5280 ft)and full exhaust we measured 122 hp at the rear wheels at about 6500 rpm. We estimate around 140 hp at the flywheel. I do not have a full steel bottom end since this is just a road car with occasional autocross and maybe a track day after I install a roll bar. It weighs in at 1496 pounds with a couple gallons of gas.
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