197 pistons into 172

[Carlos Alonso]

I want to plug in 197 oem pistons into a 172 clio, I just need the pistons or do I need something else?

 

[bozothenutter]

head, unless going turbo....
@NorthloopCup knows these in and out

 

[bloke]

They work with the standard head, gives you slightly higher cr.

 

[bozothenutter]

They work with the standard head, gives you slightly higher cr.

oooh er....never knew that......*off to find a set*

 

[bozothenutter]

There is some good info in the thread on the group N timing tool

 

[bozothenutter]

https://www.cliosport.net/threads/full-grp-n-cam-timing-tool.805210/page-5#post-11675874

Good info in here

 

[Simon998]

An ECU remap, I think bloke said on here, without one you'll be putting a hole in a piston.

 

[Christopher]

@Niall has done this I think. 197 cams too.

 

[Niall]

Mine has 197 pistons, in 182 block and 182 head, with 197 cams like Chris mentioned.

Mine’s using the three prong spark plugs, not sure I’m right in saying, but I think because they’re cooler because it’s now high comp with the pistons.

@bloke built mine so I’m sure he can give you more insight.

 

[bozothenutter]

somebody (James Bryan) on FB page mentioned using PFR7Z-TG for High comp

 

[bloke]

Had a natter to Chris about plugs and decided to go for the 197 plugs, can't remember why we decided that though, was more than a day ago sorry!!!

 

[Radugns]

I was also advised to run clio 197 spark plugs when increase the CR to 11.5:1 like 197 clio.
@Niall , have you dyno you car? I have parts for making the same engine, but need some feedback.

Thanks

 

[JamesBryan]

somebody (James Bryan) on FB page mentioned using PFR7Z-TG for High comp

Yes they are the plugs to use. They're 197/200/225/R26 plugs.

I was also advised to run clio 197 spark plugs when increase the CR to 11.5:1 like 197 clio.
@Niall , have you dyno you car? I have parts for making the same engine, but need some feedback.

Thanks

His car is running and has already done one trackday.

 

[JamesBryan]

It made 201bhp from memory @Radugns

 

[pat-t2phy]

Do you still use dephaser pulley and is the cam timing set different?

 

[JamesBryan]

Do you still use dephaser pulley and is the cam timing set different?

Yeah you still use the dephaser and the timing is group n timing or somewhere there abouts.

 

[bloke]

This is niall's graph.

Will be having a play with exhaust cam timing on it at some point as we reckon we can get a bit more out of it.

 

[Bunny xrs]

Hey all am new to the page but learning alot from it from long time I ve had close project my engine is forged OE crank 1.8 16v f4p/f4r block 760 from Laguna mk1 ph2 now I want to swap 197 pistons to my stock rods which is 143.76mm
f3r with 0.65 gasket my cams non vvt f4r style generally the result will be leading me to the 11:1 cr instead of mine is 9.8:1 cr
There will be different in the cam degree or I ll stay on same timing I ll use the 172 maps with some tunes for sure