Port and Polish

[cyrixMX]

Anyone done this to his/her precious? kekekeke :lol:

I remember someone actually told me that by doing P&P can gain easily 30-40bhp for RM1500.

[muffdiver]

In your dreams 30-40bhp is possible. Dude you should change the people you mingle around with that feed you these details. They seem to think 4-point braces are good and P&P gives 30bhp.

[cyrixMX]

hmm .. in actual fact what should we expect to see ah?

[botak]

I'd just done top-overhaul/port & polish, parts + labour(1 day job) = RM800, reasonably charged?
Does ramming/over-rev the engine(for extended time) just after the job might cause any harm & is it adviseable to run-in the engine?

[cyrixMX]

overhaul is actually rebuilding the engine .. so a burn in period .. for 5-10k km don't rev over 4k rpm :D

[volcaneoptimist]

Dear Bot...,

Anxious to know why and where you did the top overhaul/port/polish. I also contemplate doing a top overhaul as my 2.0i is starting to emit some white smoke and loss of motor oil. If it's not convenient to post here, you may email me at lfmfrancis@yahoo.co.uk :$:

[cyrixMX]

volcaneopt ... how old is ur car and what mileage done? Mine 220k still going strong B)

[senthil16V]

Guys,

Port and polish does not increase your car horsepower by 20 to 30bhp....what it does is increase your engine volumetric efficiency.....match porting is the logical approach by matching your inlet and exhaust ports on your engine block....need to dyno your car before and after mods to know whether power increase at the wheels....

:thumbs:

[puginfo]

>>> since only the cylinder head is involved in the p&p job, there's no run in required. you can revv to glory the minute its fired up.

30 to 40 fly bhp increase would be a more appropriate expectation out of a force fed application. with good p&p (not everyone does well as there's no benchflow) port matching and AFR remapping, 8 to 10 fly bhp is possible as VE has increased slightly. if you had done anything less than this, expect to have a better engine response.

cheers

[senthil16V]

Dear Puginfo,

Is there any place you know in Kl or Selangor that does benchflow testing for cylinder heads?

Any place you can recommend to do a professionally done match P&P job?

:thumbs:

[volcaneoptimist]

Hi Cyrix,

My volcane has only clocked 145k over 10 years. The perofrmance is almost as good as new and I can still touch 200kph with little effort. Somehow, my engine seems to be emitting white/blue smoke when idling after engine has warmed up but not on cold start. I suspect it could be due to sticky oil control ring(s) as there is some loss of motor oil but not coolant.

I wonder if there's any engine flush or additive in the market that could free the sticky oil rings without the need for a general engine overhaul to remedy the situation. Any positive feedback or comments will be appreciated. :$:

[muffdiver]

Sounds like your engine valve seals are worn. Temporary measures won't last long. No point waiting coz someday you'll eventually need to replace them. Better get new replacements and enjoy a 'newer' feel engine. While you're at it, change the piston rings too. You'll get closer to the new engine feeling.

A ZX should be in maximum tip-top condition to give the driver total driving pleasure and satisfaction.

[puginfo]

>>>senthil, for professional head development work (on continental models) none in KL but loads in europe. here someone could be doing some grinding in the backyards and if it makes a diff, it puts a smile on the owners face. benchflows are available in speedworks and matspeed but they normally do the japs. on knowing what they are doing on the benches, your guess is as good as mine.

[cyrixMX]

pug,

what about head skimming? I heard good and bad about it ..

Good .. increase compression == more oomph!
Bad .. it only lasted the owner 2 weeks :lol:

[puginfo]

>>> the purpose of the skim is to do with increased CR. the skimming method is the easiest and cheapest and hence many would do it. the success rate depends on how much has been skimmed for what CR and what are other parametric values made to accommodate the higher CR. if you shim and not followup on the rest of the parameters to support then its quite a high potential of failure.

there are also other ways to increase CR (as CR can be static or dynamic) but the followup on how to accommodate is the same to prevent disaster.

[cyrixMX]

cyrixMX salutes puginfo :lol: :lol:

how come u get to know so many things? :)

i suppose by changing to metal gasket and forged piston would help in this case?

[senthil16V]

Huh? Probably need to go for a set of high compression pistons and thin metal head gasket....need to put the car the on a 4 gas analyser to determine AFR so that we know whether the engine is running to lean or rich....


thank you for sharing puginfo....really sad there are no competent engine buliders in malaysia....most of them dont know what they are really doing....how is your supercharged 405 running? have you dynoed you car and how much of horses is it putting out? any chance to meet up with you?


:thumbs:

[apexc]

pug info..... is pug 405 1.9 ecu same with cit 1.9manual......

could it be more powerful than the zx.....because the pug is more heavier than the zx......heard a fren use 405 2.0 ecu in his 2.0 zx.......

just curious...... :nod:

[cyrixMX]

ah pek .. go chop shop and borrow one to try out :)

[puginfo]

>>> apex, there had been magnetis, b.motronics and also sagems used in both marques. they are different in some ways especially in the year 94 as strict emission stds were imposed. this had also seen some engines being able to produce a wee bit power due to diff. maps used. if you need explore power out of playing with ecu maps and still maintaining the ori ecu, you could try the piggy back systems which would cost like about 1600. these intercept the signals with an laptop assesible GUI-graghical user interface. and on the run you can just type in parameters in the laptop and see the diff. (of course need to know what is happening in detail). i had played around with the smartuner (on protons) and perhaps there is a possible 8/10 fly bhp possible depending on what is in nick and knackered. the best part about it is, should you want it out of the system, you just pull the connector out and just insert a direct loop conn to ecu.



cheers