cat cams 428,gutted

[partyboy23]

well been down to gdi today spent the day there was all going well until we fund out my cylinder head has been skimmed meaning the valves are hitting the piston head,im gutted,more money lol but gota say these guys know there stuff

 

[Jamesstone]

Shitter mate :dapprove: ... thats the thing with buying a second hand motor, you never know what the previous got upto

 

[realnumber 1]

Unlucky, could you not hear it knocking or any other symptoms?

 

[sideways danny]

Unlucky, could you not hear it knocking or any other symptoms?

wasn't doing it until we put the higher lift cams in. nothing apparent at idle but at soon as the phase shifter was activated when the engine was revved a little there was a properly odd noise. Changed the pulley, the plunger and spent ages trying to work it out, then remembered renault had rebuilt it under warranty. The head's clearly been skimmed

 

[172Ben]

how would you go about rectifying it?

Gasket plate?

 

[mini-valver]

How much have they taken off??? Thats a big old lift to be having valves munching pistons....

 

[sideways danny]

How much have they taken off??? Thats a big old lift to be having valves munching pistons....

no idea, still runs fine with the phase shifter unplugged. need to remove the head

more lift at TDC + material removed from the head = too close

 

[partyboy23]

i couldnt tell ya how much,but danny im coming down on thursday with it and ill be leaving it with you until saturday,im going to go ahead with the piston head skim,i mite as well,i tryed fonin u after leaving,so ill give you guys a ring tomoz after iv spoken to renault and arrange something,cheers for today bud

the car was fine when i bought it pre owned the engine went when i had it,and was a horrid noise at about 2k i think

 

[mini-valver]

May be cheaper to buy a new head?? OR, fit a thicker HG.

 

[partyboy23]

nope we have revised this option problem is there will always be labour costs etc

 

[mini-valver]

Had a look at thicker gaskets??

 

[partyboy23]

tbh i think andy at gdi would of suggested this to me is that was an option,not to sure tho

 

[mini-valver]

It's not an ideal solution but it will work and be cheaper.

 

[172Ben]

thicker gasket or get a plate made up, around £100 for a plate.

 

[ditz]

cut the valve seats further in is,, easy fix

 

[172Ben]

http://www.ferriday.co.uk/cnc/decompression_plates.shtml

This guy used one as his pistons were like this-

 

[sideways danny]

enlargen the valve cut-outs in the piston is the plan. thicker gasket would drop the compression, this way the drop is minimal may even get a benefit of a higher than stock CR

 

[partyboy23]

intresting i will suggest it,nice one

lol no need to suggest no more lol

 

[ditz]

is that not pistons out to mill them???

heads got to come off anyway,, cut the valve seat a few thou further down?

i dont even think you'd have to remove anything of them stem as the lash adjusters would take it up

 

[sideways danny]

meh, we'll see. Bore scope on it first before ANYTHING happens

 

[partyboy23]

yeah true,like i said dan ill come down on thursday morning mate,and plus tbh if this thicker gasket is an option i think id rather go that way as said earlier funds are tight

 

[ditz]

meh, we'll see. Bore scope on it first before ANYTHING happens

dont know if you get the same snap on deals where you are,,

seen the bore scope they are selling £199?

ordered mine lol

 

[sideways danny]

meh, we'll see. Bore scope on it first before ANYTHING happens

dont know if you get the same snap on deals where you are,,

seen the bore scope they are selling £199?

ordered mine lol

tried one out. Amazing until you put the mirror attachment on TBH

 

[sideways danny]

yeah true,like i said dan ill come down on thursday morning mate,and plus tbh if this thicker gasket is an option i think id rather go that way as said earlier funds are tight

call tomorrow

 

[partyboy23]

will do bud

 

[stan*]

Would take more than cutting the seats back by a couple of thou....more like 0.010-20!

Good excuse for forged pistons if you ask me...pistons are gonna have to come out either way, may cost an extra say £350-400 compared to milling the cut-outs in the std pistons, but on a bill which is going to be reasonably high anyway, this may be worth considering.

Other logical thing you could is knock the inlet timing back a fraction.

 

[BenR]

The head skim must of been massive to cause those issues, i've deliberately skimmed over half a mill off stock heads with 428's and and stock pistons. Sure its not something else, like a slip or a mistake? Its happened to me before. Have you checked the actual clearance running the 428's?

I'd of also said it would be more than £400 ontop as there would be substantial extra labour involved with stripping the block bare to rebuild up with new pistons.

 

[sideways danny]

Mystery solved. The head had indeed been skimmed, but that wasn't the issue.
The engine was rebuilt by a renault dealer under warranty. Not very well it seems, all 4 pistons are the wrong way round, so the larger pockets for the inlet valves are on the exhaust side and vice versa. Looks like it's being paid for and the dealer seems to be being reasonable which is a relief

 

[mini-valver]

Just turn the block round.

 

[SBV116]

^^ lol!! But it would be much easier to swap the valves side to side.....

 

[BenR]

Pistons wrong way round!!!

WTF!.

 

[sideways danny]

Pistons wrong way round!!!

WTF!.

I know!!! stood speachless for about 15 minutes when i realised

 

[BenR]

hope you didnt get paid to stand still for 15 mins.

 

[mattjk]

Interesting read that, glad its sorted for you.

hope you didnt get paid to stand still for 15 mins.

LOL love it!

 

[Andy GDI]

worth every penny of that 15 mins too...

 

[Ali]

PMSLLLLLLLL!!!! @ Ben

 

[sideways danny]

hope you didnt get paid to stand still for 15 mins.

like the lorial ads I'm worth it

 

[BenR]

L'Oréal........still worth it?

 

[ben_p]

roffle

 

[r8byb]

seem's rather far fetched