What would you do in my shoes - Engine Modifications

[Jordysport]

So I've got a Clio 182 Engined Vehicle running AT Power Throttle Bodies & OMEX 600 ECU with straight through exhaust system (decat) The purpose of the vehicle is to be used in prod or mod prod class in hillclimbs & the occasional road use (Road legal). Its fully stripped and just about to have a Full Cage welded in, will be running BC Racing Coilovers & standard 182 brakes with CL pads, so those area's are covered. The cams seem to be the restricting component here, and would be nice to get rid of the dephaser and a nice new belt on there.

Question is what cams would give the best performance on a standard head (or little modifications to head) as the Cat cams 428's seem a little soft for my application,

Many thanks

 

[Fletcher]

I would go for 421s.

 

[Jordysport]

I do like the 421's but how do they perform on verniers rather than vvt.

Long run i would want to go down the uprated valve springs & caps route with lairy cams but for the first map i think 421's will suffice

 

[Cub.]

I'm with Fletch. 421s.

 

[Jordysport]

What about Piper 270's they seem almost identical to the Catcam 421's ?

 

[Mr R.]

421's i have a pair going into my PH1.

I think if you want to go for anything more then piston mods have to be done. 421's with the vvt will be fine Mick @ diamond motors runs them in his car.

 

[Mr R.]

What about Piper 270's they seem almost identical to the Catcam 421's ?

@P1 Tom i think has these in his PH1 with a ported head and Supertec valves with good results.

They are 1/2 the price of 421's

 

[Chip-mk1]

421s or pipers are both a good option.

Or just bite the bullet and get some new pistons and go to a 422, which is what I would do if in your shoes.

 

[Jordysport]

Chip: that is the long term plan but in the meantime i think piper 270's would be a good option

I'd like to remove the Dephaser as don't know the condition of it and for reliability adjustable verniers should be the better option???

 

[Chip-mk1]

For just a hillclimb car then fixed pulleys probably make sense as not like you care about a lumpy idle or idle emissions etc.

 

[Jordysport]

For just a hillclimb car then fixed pulleys probably make sense as not like you care about a lumpy idle or idle emissions etc.

Exactly, and lumpy idle is quite nice . Sourcing these, I see Ph1tom has listed the link for Pipers at their cheapest £312 iirc. what brand / make and prices are out there for Verniers, i see piper don't do any.

 

[Dan@SJM]

Just a pain to time them up on non VVT.

Tbh buy a new dephaser and it'll last the time that your hillclimbing it. IME they suffer more from town driving.

 

[Chip-mk1]

Given that its a floating pulley anyway, you can probably just use an exhaust pulley? although it will then mean timing it in at the cam end not on verniers, but thats fine if you just want to set it up once to standard timing and leave it.

failing that, catcams do them as a vernier

 

[Chip-mk1]

Just a pain to time them up on non VVT.

Tbh buy a new dephaser and it'll last the time that your hillclimbing it. IME they suffer more from town driving.

Or just carry on with the one he has on the pipers if he is planning on replacing the engine relatively soon with a forged one anyway.

That is what I would do TBH

 

[NorthloopCup]

Exactly, and lumpy idle is quite nice . Sourcing these, I see Ph1tom has listed the link for Pipers at their cheapest £312 iirc. what brand / make and prices are out there for Verniers, i see piper don't do any.

Use the verniers for a Williams mate. They work on the f4r.

 

[Budgie]

I'd save the money and put it towards tyres & fuel.

Engine mods on a Clio unless going BIG money are pointless.

 

[Chip-mk1]

I'd save the money and put it towards tyres & fuel.

Engine mods on a Clio unless going BIG money are pointless.

If it was a road and trackday car I would agree, but for a hillclimb car even 10bhp is worth having.