Bent 172 turbo conrod

[Chip-mk1]

Amazed to find this, car still drove mint, still went like stink and even still idled properly, but look how bent one of the rods was when me and Danpl6 pulled it apart today!

Its actually bent in TWO directions, front to back and side to side.

Lucky it didnt snap really.

 

[black_sunrise]

how did that still run right?! lol

 

[.Stevo.C.]

Oops. What torque were you running chip?

 

[Daz_RT_04]

Lol christ!

 

[Chip-mk1]

Oops. What torque were you running chip?

Dont know mate, I mapped it on the road where you dont get figures like on the rolling road.
Last time it was on the rollers it was only 250 but that was with well under a bar where as by the end when I knew I replacing it anyway and so was just having a laugh seeing what I could get it to take it hitting 2 bar on the overboost though, so probably some fairly big numbers, lol

 

[Chip-mk1]

how did that still run right?! lol

Amazing isnt it!

Was high 9s compression on 3 cylinders and 7 or so on the fourth one, lol

 

[.Stevo.C.]

Dont know mate, I mapped it on the road where you dont get figures like on the rolling road.
Last time it was on the rollers it was only 250 but that was with well under a car where as by the end when I knew I replacing it anyway and so was just having a laugh seeing what I could get it to take it hitting 2 bar on the overboost though, so probably some fairly big numbers, lol

Lol brilliant. Just as well you are forging it now then eh!

 

[Chip-mk1]

Lol brilliant. Just as well you are forging it now then eh!

Yeah, definately required rods rise, although the pistons are still fine, shows how much you can get away with on the standard pistons if its mapped right!

 

[.Stevo.C.]

Yeah, definately required rods rise, although the pistons are still fine, shows how much you can get away with on the standard pistons if its mapped right!

Yeah deffo hence why I only opted to change the rods in my meg in the end as the standard pistons are rated to 300+ according to Paul at rs tuning.

 

[TheEvilGiraffe]

Self adjusting compression to help enable you to up the boost...

What a clever engine !!!

 

[TimR26]

That's probably what my rods look like lol

 

[Craig.]

Thats mad to say it was still running fine.

 

[Chip-mk1]

That's probably what my rods look like lol

Quite possibly mate.
The worry of course is that eventually they will snap, then your engine really gets killed.

 

[mark123]

Mental lol.

Is that just a standard 172 rod?

Are the f4rt ones much better?

 

[Chip-mk1]

Yes it's a standard rod. Another one bent too but not as much.

F4rt are slightly more manly, but only by a small amount.

Have got steel rods and forged pistons for the new engine I'm building.

 

[Jaff.]

Surprised it wasn't thrown off balance!

good effort

 

[Chip-mk1]

Surprised it wasn't thrown off balance!

good effort

Nothing you could discern while driving it. No weight difference of course so balance in that respect wouldn't be effected much anyway.

It really was still driving very well. Last time I drove it I took loads of people out in it and they were all impressed by it.

 

[Michael Woodford MST]

Hahaha! I'd love to know the power graph of that thing when you were running the high boost!

Epic Clio refused to die!

 

[Dan@SJM]

It was when I wound it to TDC and said, "Errr, mate you've bent a rod." "You sure?!" "Certain. Look." "Oh yeah."

 

[Tutuur]

Lol! That looks funny!

that's the reason why i used 16v rods in my budget build. They are a lot beefier!
Good moment to pull it apart though!

Scoff had 450bhp out of his f4r before the first rod snapped.

 

[Chip-mk1]

Hahaha! I'd love to know the power graph of that thing when you were running the high boost!

Epic Clio refused to die!

Yeah it's a shame I didn't ever put it on the rollers to get some high boost figures I suppose but as you know I'm pretty busy and just never got round to it tbh.
Wont make anymore power on the new internals so I guess if I roller it once its back together we will have a very good idea what power finished the rods off.

 

[Chip-mk1]

It was when I wound it to TDC and said, "Errr, mate you've bent a rod." "You sure?!" "Certain. Look." "Oh yeah."

When you said it was bent I was just about to grab some feeler gauges to check but as I glanced over it was certainly pretty obvious you were right. Lol.

 

[Andyrg@ ClioTurbo]

Wow! Im a big believer that people who say that the Megane 225 Ring lands are weak have had bad mapps, keep the car cool with a little extra fuel and all seems ok, just like the 2.5 Subaru Motors.

Chip inpressed son Oh look there is the biggest regret ive made EVER in the back ground of the first pix

 

[Andyrg@ ClioTurbo]

Chip the F4RT Rods have the Same part number to the 172 /182 Rods last time i looked :/

 

[Chip-mk1]

Agreed on the pistons, keeping fragile pistons in one piece is just a question of correct mapping a lot of the time.

Lol @ regret, sadly won't ever be selling the LY mk1 back to you to undo that, we just love it far too much!

 

[Chip-mk1]

Chip the F4RT Rods have the Same part number to the 172 /182 Rods last time i looked :/

Yes but going by the pictures laine posted that is just cause they have been superseded to the same replacement part and the originals were different.

 

[Andyrg@ ClioTurbo]

Ah ok big Lad.

If i purchased that back the wife would take me to court for every thing I spend a fortune on that thing!!!! I still want to a have a go when we meet mind for old time sakes I also regret scrapped the red one too, I hate the look of the phase 2 172 LOL Valver FTW

 

[Chip-mk1]

Help yourself any time mate

 

[Andyrg@ ClioTurbo]

Now thats a GENT,

 

[Laine_16v]

Goof effort chip, that must have been pushing a rather large chunk of torque with 2 bar overboost lol! Nice to see limits being pushed!!

 

[Chip-mk1]

Goof effort chip, that must have been pushing a rather large chunk of torque with 2 bar overboost lol! Nice to see limits being pushed!!

Yeah it was surprising how well it pulled at 4K or so in 5th gear with that sort of monster torque, but TBH it was far less driveable on track like that, so not where I want to be with the car, as a lot of what it gets used for is trackday use anyway.

A road overtaking in 4th gear though, pulling from 70-120 etc, it really was epic.

 

[Dan519]

Chip the F4RT Rods have the Same part number to the 172 /182 Rods last time i looked :/

nope, same as 197 though

 

[LIL B]

Looks within Renault tolerances.

 

[Chip-mk1]

Looks within Renault tolerances.

FLOL

True, might have been like that all along, lol

 

[Scoff]

Lol! That looks funny!

that's the reason why i used 16v rods in my budget build. They are a lot beefier!
Good moment to pull it apart though!

Scoff had 450bhp out of his f4r before the first rod snapped.

That was with a 1.8 crank though so not really comparable. That motor was about RPM. I broke one in half and the other 3 came out looking like the picture.