Info From Mitsubishi

wildfaye · Post by **wildfaye** » Mon Jul 19, 2004 1:50 pm

dannyboyau wrote:you can get custom forged pistons made.

I just had some made for the 6A13 engine they are currently in being ceramic coated

Danny, are u making stock sized pistons or oversized ones?
How much did the forge ones cost u? Weight? Wats the benefits of using forge pistons?

Thanks!
Sam

salacious · Post by **salacious** » Mon Jul 19, 2004 8:42 pm

The main advantage of forged ceramic coated pistons is that they'll survive higher engines temperatures which means you can run higher boost

dannyboyau · Post by **dannyboyau** » Mon Jul 19, 2004 10:48 pm

mine where 20 thou oversize and cost about 2K. you will get them cheaper if you go for one of the cheaper brands.

Have to wieght them to find out.

The ceramic coating will actually improve performance.

The coating on the side skirts reduces friction and the coating on the top reduces heat transfer and it also gives better protection against detonation.

wildfaye · Post by **wildfaye** » Mon Jul 19, 2004 11:37 pm

dannyboyau wrote:mine where 20 thou oversize and cost about 2K. you will get them cheaper if you go for one of the cheaper brands.

err...i done understand yr statement...could you explain 20 thou oversize?

where did u get them made?

dannyboyau · Post by **dannyboyau** » Tue Jul 20, 2004 6:31 pm

they are 20 thousandths of an inch over size, i had them made in the USA so they are measured in imperial, sent one piston from my 6a13 over and they made 7 for me all of them 20 thousandths of an inch over size.

wildfaye · Post by **wildfaye** » Tue Jul 20, 2004 7:05 pm

Ahhh....i understand now!

Do you have contacts of this maker? It costed u 2k AUD for a set of 7?

20 thous of an inch is 1/20000 inch? no?

wildfaye · Post by **wildfaye** » Tue Jul 20, 2004 7:15 pm

ok let me try instead

1/10 is 1 tenth
1/100 is 1 hundredth
1/1000 is 1 thousandth

20/1000 is 20 thousandth...meaning its a 2% increase rite?

dannyboyau · Post by **dannyboyau** » Wed Jul 21, 2004 2:39 am

i bought them through a supplier here in Perth.

I gave him a piston and he sent them over and i paid him for them, also it depends what the exchange rate is, when i got mine we were getting 80 USD for 100 AUD

20 thousandth of an inch = .508 mm

Black_FTOGPX · Post by **Black_FTOGPX** » Wed Jul 21, 2004 9:58 am

So what will this take your 6A13 out to? 2.6lt?

Do you have to bore out the block, or because they are not huge compared to the standard ones you donâ€™t have to?

wildfaye · Post by **wildfaye** » Wed Jul 21, 2004 10:40 am

Yups, i meant a 2% of an inch.

It effectively means u upped your engine capacity rite? Why didn't u go 1mm instead? Any particular reason?

Do you know the exact manufacturer of your forged piston?
I am thinking of sending them to have them forged as well!

Do you think its necessary to do the camshafts, crankshaft and the connecting rods for the pistons?

dannyboyau · Post by **dannyboyau** » Thu Jul 22, 2004 1:22 am

Black_FTOGPX wrote:So what will this take your 6A13 out to? 2.6lt?

Do you have to bore out the block, or because they are not huge compared to the standard ones you donâ€™t have to?

If you put bigger pistons in you need to get the block bored.

dannyboyau · Post by **dannyboyau** » Thu Jul 22, 2004 1:30 am

wildfaye wrote:Yups, i meant a 2% of an inch.

It effectively means u upped your engine capacity rite? Why didn't u go 1mm instead? Any particular reason?

Do you know the exact manufacturer of your forged piston?
I am thinking of sending them to have them forged as well!

Do you think its necessary to do the camshafts, crankshaft and the connecting rods for the pistons?

Yes upped capacity only slightly, only went .5mm so as there is still plenty of meat in the bore so that can bore it out more in the future if necessary.

this set is Ross

depends on your budget, how much you want to spend, and what is your goal.

I would get my heads CNC match ported, ceramic coated and new cams before i would put bigger pistons in, if i was staying N/A

If you want to improve performance you want more air and fuel in the combustion chamber, easiest way to do this is with a turbo.

wildfaye · Post by **wildfaye** » Wed Aug 11, 2004 1:53 pm

Hi peeps, got back from the local Mit distributor on piston prices.

The stock sized ones will cost around SGD80.00 per piece.
They do not have any oversized ones in stock, but prices will also be in the same range.

Hope this helps!

dannyboyau · Post by **dannyboyau** » Thu Aug 12, 2004 3:25 am

can you get some prices on some big end and main bearings, I think i might start buying my parts from singapore.

Post by **smorison** » Thu Aug 12, 2004 8:10 am

danny,
how much is 0.5mm capacity wise???
did you do this to the 6a12 or 6a13???
what sort of cost is associated with this???

wildfaye · Post by **wildfaye** » Thu Aug 12, 2004 1:41 pm

dannyboyau wrote:can you get some prices on some big end and main bearings, I think i might start buying my parts from singapore.

Hi Danny, will try to do so, please be specific on the parts and the part numbers, have you got the Mit Caps program? It'll be very useful.

As I mentioned, the ovesized pistons are not in stock, so do not be disappointed if I cant get the prices for you.
Have you thought about freight costs? It may not work out.

Just drop me a note with your relevant parts and I'll do the pricing for u!

Cheers!
Sam

wildfaye · Post by **wildfaye** » Thu Aug 12, 2004 1:44 pm

BTW, some mention earlier in the thread that the oversizes measurement of 0.5mm and 1.0mm is the radius not diameter, can anyone confirm this?

0.5mm= 1mm increase overall diameter and
1.0mm= 2mm increase overall diameter.

Will the new cams Unique are doing able to match up with these pistons...or is Unique coming up with forged oversized pistons??

Post by **smorison** » Thu Aug 12, 2004 1:52 pm

wildfaye wrote:Will the new cams Unique are doing able to match up with these pistons...or is Unique coming up with forged oversized pistons??

at the moment they are "stage 1" cams sort of thing...

doing new pistons and the like is a completely different project that should be considered part of a engine capacity increase. If/When i get around to doing this... a stage 2 cam would be developed...

dannyboyau · Post by **dannyboyau** » Sun Aug 15, 2004 3:17 pm

smorison wrote:danny,
how much is 0.5mm capacity wise???
did you do this to the 6a12 or 6a13???
what sort of cost is associated with this???

.5mm equates to an increase in capacity of 31 cc total for 6 cylinders

I did this to the 6A13 because i scored to block when I detonated the pistons.

Total cost for engine rebuild, with custom forged pistons and rods, heads ported and ceramic coating of valves, combustion chambers, exhaust ports and pistons, block decked and rebored, torque plate made for block rebore, full engine rebuild gasket and seal kit, new water pump, new timing belt, new timing belt tensioner and idler bearing, crankshaft bead blasted and polished, modified sump, new injectors, custom made fuel rails, engine rebalance, labour. will cost just over 10 K

dannyboyau · Post by **dannyboyau** » Sun Aug 15, 2004 3:31 pm

wildfaye wrote:BTW, some mention earlier in the thread that the oversizes measurement of 0.5mm and 1.0mm is the radius not diameter, can anyone confirm this?

0.5mm= 1mm increase overall diameter and
1.0mm= 2mm increase overall diameter.

Will the new cams Unique are doing able to match up with these pistons...or is Unique coming up with forged oversized pistons??

The oversize measure ment is usually for diameter.

Also i did the math for a increase in piston diameter of 2mm you will get a total increase in capacity of 103cc or you would take your 2Ltr engine to a 2.1 Ltr engine this would give you an increase in power ( with no other mods )of aproximately 2.5% or 5 Hp

Here is the Formula: Engine Displacement = #Cylinders x pi/4 x Bore(2) x Stroke

Also as a basic rule of thumb they say that if you increase capacity of your engine 100%, expect a 50% increase in horsepower for the extra capacity.

eg. you increase a 2 ltr engine that produces 100 Hp to a 4 Ltr engine you would only get an extra 50 Hp, for a total of 150 Hp.

FTO AUSTRALIA

Info From Mitsubishi

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