Lightened Mi16 Flywheel

[chris adams 0]

does anybody have or sell a lightened/balenced mi16 flyweel, or do the machining

Edited July 19, 2011 by mi8 turbo

[cammmy 1]

I found something on google a while ago. Have a search

[chris adams 0]

yea ive found 1 at hiflowheads for £88 so going give them a bell.

[JeffR 51]

You could get your flywheel lightened when you get the entire bottom end balanced by a competent machine shop. A worthwhile investment IMHO.

[chris adams 0]

im not planning on opening up the turbo engine otherwise it will open a whole can of worms ie hone the bores new rings throw in the 92mm stroke crank which needs polishing skim the pistons machine out the dish to compensate the overstroke also machine the head to lower the compression new bearing shells so on and so forth. and thats not what i want to do yet.i need to save some money to upgrade the trannys first those are my next most important areas to consentrate on and at £500 for the diff cage and pinions upgrade its goin to take some saving, dont forget im out of work

Edited July 21, 2011 by mi8 turbo

[cammmy 1]

Machine the head to lower the compression? You mean you are going to increase the volume of the CC's?

[chris adams 0]

well if i stick in the overstroked crank id have to skim the pistons qiute a lot which increases the compression i could gain some back by fully machining the dish around the piston but i doubt it will be enough so i would have to machine some out of the head aswell or just stick in a spacer plate, which might be cheaper

 

Edited July 21, 2011 by mi8 turbo

[chris adams 0]

Machine the head to lower the compression? You mean you are going to increase the volume of the CC's?

 

yea remove some material to increase the cc s. what you said !

[petert1345402284 0]

Sorry to change topics, but I don't think I'd ever bother stroking a turbo engine. Why not just wind up the boost? And/or change the cams? Fit an intercooler? It already has a steel crank, so nothing to gain there.

[chris adams 0]

im led to believe that the extra torque is well worth the exchange even if it is for the turbo motor. i have already got the 2.0 xsi cam, throttlebody, turbo technics mani and t25 turbo to solve some of the breathing issues, the boost will be turned up as much as possible and untill ive mounted the engine im not buying an intercooler but there will be one in place.

[petert1345402284 0]

Are you talking about a 16V or an 8V?

 

And you know that all XU10 flywheels are the same as an Mi16?

[chris adams 0]

im talking 8 valve. i didnt realise xu10j2te flywheel was same as mi16 tho.

[petert1345402284 0]

If 8V, why are you mucking around with an XSi cam? You should get it reground with a wider lobe centre angle (and more duration if desired) so it better suits the turbo application.

[chris adams 0]

a lot of threads ive read use the gti cam or xsi with saying its more lively than the standard turbo cam even cat cams say the fast road cam is a good upgrade for the turbo. personally id never go for a reground cam.

Edited July 27, 2011 by mi8 turbo

[petert1345402284 0]

personally id never go for a reground cam.

 

why?

 

[chris adams 0]

just somethings ive read . http://mgaguru.com/mgtech/engine/cm106.htm

[chris adams 0]

and catcams view

 

Matt Sav. ! The profile is restricted to the amount of material on the original cam which generally means short duration/high lift profiles are not an option. Also it raises the fololwers higher in the head which leads to followers rocking and wearing the head out much faster. And as the base circle is reduced the radius on the nose of the lobe becomes smaller which promotes faster wear.

Edited July 28, 2011 by mi8 turbo

[petert1345402284 0]

But you'd fit a 2nd hand XSi cam onto 2nd hand buckets that came from a different engine?

 

Matt's comments really aren't applicable to the 8V as the buckets are very long. In addition, you can fit lash caps to avoid having a shim outside the OEM range, which is very wide at 4mm max. Most shims are half that thickness and 2mm isn't removed from the base circle. So lots of wife's tales in their my friend.

 

Most amature cam installations fail because of new lobes on old lifters/buckets, insufficient run in time and incorrect lubricant. Do a search on the Crane website. There has been plenty written about the lack of zinc in modern oils and how this effects initial cam lobe run-in. ( see Crane Break-In Lube). Peugeot 8V cams are very soft and need to be carefully installed and run-in correctly.

 

[chris adams 0]

oh it wouldnt be any old seconhand cam it would have to be good condition on the lobes. plenty of inspection, the buckets ive got are at the machinests being skimmed so they are all the same height and flat.

[chris adams 0]

is there any specific lift and duration that could be focused on in a blank cam grind for a turbo motor or is it hit n miss depending upon spec and what is wanted/needed from the car?

[chris adams 0]

what about if i used the specs from a cosworth would those be any good?

[chris adams 0]

disgard that last post while my turbo manifold is close to stock and initally to small for the engine from factory, it is best to use a normally aspirated cam due to the excessive back pressure the xu10j2te suffers from.

Edited July 28, 2011 by mi8 turbo

[petert1345402284 0]

it is best to use a normally aspirated cam due to the excessive back pressure the xu10j2te suffers from.

 

No, that's a compromise. I turbo cam has wider lobe centre lines than standard so that the overlap period is reduced. Have a look at the profiles on the Catcam website and you'll notice that the exhaust has little or no lift at TDC. You can still have more lift and duration to fine tune for a desired rev range.

Edited July 29, 2011 by petert

[chris adams 0]

its not a compromise as the standard cam runs dry at high revs. fair dooes that the boost kicks in a little over 500 rpm later but who cares.?

Edited July 29, 2011 by mi8 turbo

[chris adams 0]

just because the cam specs say they have so much lift and duration does not mean it will work well for a perticular application.