displaying posts 1 to 14 of 14

Author Subject: cams?
309btcc

**DODGY SELLER**

Location: england

Registered: 07 Jul 2009

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Post #1
what are the bigst cams i can run on standard internals
Posted 3rd Jun 2010 at 02:00
Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

Posts: 7,757

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Post #2
Kent PT81's if the head hasn't been skimmed, but you'll need to time them up carefully to make sure you don't exceed the maximum lift available at TDC.

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Rich
Posted 4th Jun 2010 at 00:27
rallyeash

Seasoned Pro

Location: Devizes

Registered: 11 Dec 2006

Posts: 4,424

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Post #3
have a search and you will see there isnt much cam choice available with standard pistons and without taking the head off you arent sure if it hasnt had a skim. Get some decent pistons in there and do it right Thumbs up

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Posted 4th Jun 2010 at 01:51
309btcc

**DODGY SELLER**

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Post #4
expensive tho ash and big job i just wana get pt81s and btcc inlet and remap pedro did that and got 215bhp that is enuf for me
Posted 4th Jun 2010 at 01:57
rallyeash

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Post #5
309btcc wrote:
expensive tho ash and big job i just wana get pt81s and btcc inlet and remap pedro did that and got 215bhp that is enuf for me


LOL you wont see 215 from those mods! unless you have rollers set up for pub talk

________________________________________

230 hp 2.1 16v XU 205 rallye on jenveysHyper Project thread here
309 3dr K20 Type R
Posted 4th Jun 2010 at 02:01
309btcc

**DODGY SELLER**

Location: england

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Post #6
really pedro rekons he did and the car is a rocket destroys type rs etc
Posted 4th Jun 2010 at 02:03
rallyeash

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Location: Devizes

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Post #7
iirc btcc inlets are designed for high powered engines and no good on standard (ish) lumps

a set of cams and a remap from say chipwizards may see you in the mid 180's.

________________________________________

230 hp 2.1 16v XU 205 rallye on jenveysHyper Project thread here
309 3dr K20 Type R
Posted 4th Jun 2010 at 02:07
309btcc

**DODGY SELLER**

Location: england

Registered: 07 Jul 2009

Posts: 530

Status: Offline

Post #8
ohh hmmm i dont get how his car can be that quick ten on just that ??
Posted 4th Jun 2010 at 02:10
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

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Post #9
LOL

as Daveyboy found IIRC, a BTCC inlet will lose some torque midrange, they were made to suit sustained high revs with long duration cams, not what you'd find from a mildly modified road engine.

you'd be much better off retaining a 100% standard inlet manifold, OR getting a proper set of throttle bodies.

best bet if you can't afford a decent set of pistons is to have the cutouts made deeper, Martin (CRF450) and sandy brown can get this done.

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Posted 4th Jun 2010 at 02:12
309btcc

**DODGY SELLER**

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Post #10
do i have too take the pistons out for that
Posted 4th Jun 2010 at 02:13
rallyeash

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Location: Devizes

Registered: 11 Dec 2006

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Post #11
yup

if you stick a set of cams in an unknown engine the pistons can eaasily be kissing the valves, you probably wont even notice for a while but you will soon find out! costing you more in the long run.

if you are looking at having your standard pistons machined best to pick up another set, have them done and swap them over. all can be done without removing the engine if needs be.

________________________________________

230 hp 2.1 16v XU 205 rallye on jenveysHyper Project thread here
309 3dr K20 Type R
Posted 4th Jun 2010 at 02:23
309btcc

**DODGY SELLER**

Location: england

Registered: 07 Jul 2009

Posts: 530

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Post #12
thanx ash
Posted 4th Jun 2010 at 02:30
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #13
I have a good set of standard pistons out of a 60 thousand miler Chris, £50 and they are yours.

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R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars
Posted 4th Jun 2010 at 05:06
jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

Status: Offline

Post #14
309btcc wrote:
expensive tho ash and big job i just wana get pt81s and btcc inlet and remap pedro did that and got 215bhp that is enuf for me

Dennis has machined pistons and PT81's in his track car and is managing about 195 horses, can't see the inlet making 20 horses, especially after seeing Jims inlet lose power.....Unsure

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Posted 4th Jun 2010 at 05:33

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