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1.6 bottom end
- Thread starter AstoN
- Start date
mk4 golf gttdi180
well they rev 6000-7000 so they wont take more than that
mk4 golf gttdi180
not healthy to bounce the revs
ClioI Ph.3 1.6 16V
The guys from Catcams told me it´s possible up to 7,200rpm with the OEM valve springs. I personally go up to 7,000 that´s enough with the peak power actually at 5,990rpm....
M
mini-valver
The standard pistons are the worst part TBH. I'm having the limiter set at around 7.5 which is probably about as much as I'd dare to go. My engine will make power higher up the rev range so having a higher limiter is beneficial to me.
M
mini-valver
Dry sump 
ClioI Ph.3 1.6 16V
Do you think they are too heavy or from design point of view?
M
mini-valver
They're just weak apparantly. I'm just going by what BenR has said as I wanted to rev the balls off it
ClioI Ph.3 1.6 16V
Would be helpfull for better idling behaviour and also filling at high revs. I have catcams´ stage 3 and still OEM comp ratio, works also fine, but will not use the full potential of the cams.
@mini-valver
What pistons do you use? Woessner?
ClioI Ph.3 1.6 16V
Should be O.K., but check if there is enough clearance between valves and piston if you skim the head.
Do you have the factory exhaust collector with pre-catalyst? If yes, remove it and replace by a sport exhaust manifold, there is one availible from Supersrint, but it´s also possible to modify a 172-Manifold by welding a K4M specific flange plate to it.
I did this for my MéganeII...
Normally the are easy and pretty cheap to get, because many 172 owners install the 182 manifold...
Do you have the factory exhaust collector with pre-catalyst? If yes, remove it and replace by a sport exhaust manifold, there is one availible from Supersrint, but it´s also possible to modify a 172-Manifold by welding a K4M specific flange plate to it.
I did this for my MéganeII...
Normally the are easy and pretty cheap to get, because many 172 owners install the 182 manifold...
Yozza'd Titanium 182
what do they do mate?
ClioI Ph.3 1.6 16V
Reducing port spacing from 89mm to 85mm....
M
mini-valver
Oliver, I'm using a completely standard bottom end for now!!
ClioI Ph.3 1.6 16V
I don´t know what is the maximum compression ratio what you can reach by skimming the head when you have a K4M-engine, but with pistons you can got up to 12:1 or even higher...
Should be O.K., but check if there is enough clearance between valves and piston if you skim the head.
Do you have the factory exhaust collector with pre-catalyst? If yes, remove it and replace by a sport exhaust manifold, there is one availible from Supersrint, but it´s also possible to modify a 172-Manifold by welding a K4M specific flange plate to it.
I did this for my MéganeII...
Normally the are easy and pretty cheap to get, because many 172 owners install the 182 manifold...
I know this is an old thread, but anywayz;
Regarding the modified 172 exhaust manifold, where did you put the O2 sensor? I have a megane1 1.6_16v K4M and i'd like to do the same thing.
Thanks.
