Superlight R500 D engine vs 420

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CtrMint
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Haha, not possible over mine giving me a headache this evening, worth it though.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
Derek Batty
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Poss diff angle.  ,,,I have sigma 150 , any body swapped to a  durotec ,  two   ltr , is it worth it plus what is  aprox cost   Rather  than shopping cars ?

 

derek 

 

David_Long
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In simple terms, it's more RPM and better breathing that adds the extra power to the R500. The 420/R400 are basically crate engines with minor changes -  mainly a different camshaft. The early R400 have ARP rod bolts but not later cars. The R500 has uprated rods and pistons and CNC head.

CtrMint
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Hey Derek,

You're welcome to drive mine if you are interested in how it feels.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
Derek Batty
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Thanks mark 

derek

Geoff Brown
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Having a 2013 R400D I can say that the mods/upgrades to this engine as far as I know are: camshafts, valve springs, con rods & bolts, green injectors + RBTB as an optional extra.

I believe that the R500D followed the same regime with different pistons? - well the earlier ones did - as well as a more gas flowed head + RBTB as standard. 

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R400D ran stock Ford con rods and pistons, early ones have ARP big end bolts, they also ran standard injectors the 'big green' Bosch were only on the R500D

CtrMint
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So there's a difference between the R400 and 420R engine then.  A noticeable difference?

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com
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AFAIK, no, this was just a marketing exersice in rebranding the range - it is still a 210BHP 2.0 Duratec on a plenum

Mrp
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What about if you have RBTB's and no plenum ???

What are the difference in the quoted performance figures between a 420R (effectively a 440R) and a R500

Mrp

Mrp 420R