Question About Std Size Cam..

[Xaser]

A few days ago I bought a Cam in USA.
The code are MD023151 Are in original Mitsubishi Box, and without Use 100 % new.

Today i decide to "fosfatice" ( a treatment to make more superficial hard) and to Measure it, but i find a litle wired the number..

Look, this is the numbers.






Now, my question, this 12.1 Valve lift, anda 99° of Lobe center, are for a ORiginal 4G54 cam?
Becouse the Duration are like STD cam, but the others... i thing not :S

[Xaser]

nobody?

[rob020]

mabye the cam timing in the workshop manual is at 50 thou lift?

[Xaser]

This is not the manual, is the measuring with a program and machine ( Cam Doctor)



More easy my question, how is the valve ( or cam) lift in 4G54 Standart Cam?

[woops]

I don't know if this will help you at all but here are the cam specs for the Sigma GK Astron NA model. I think it would be for the astron 1 head but it could be the 2 because they don't state a second version type. I think the GK had the astron 1 and then got the astron 2 partway through the run but I'm not positive. Well the compression ratio is for a 8.2:1 so whatever engine that is for.

Valve timing . . . . . . . . 2.0L engine . . . . . 2.6L engine
Inlet Opens. . . . . . . . . 24° BTDC . . . . . . . 25° BTDC
Inlet Closes . . . . . . . .. 64° ABDC . . . . . .. 59° ABDC
Duration . . . . . . . . . .. 268° . . . . . . . . . . 264°
Exhaust opens . . . . . .. 59° BBDC . . . . . .. 64°BBDC
Exhaust Closes . . . . . .. 25° ATDC . . . . . . 20° ATDC
Duration . . . . . . . . . . 264° . . . . . . . . . . 264°
Overlap . . . . . . . . . . . 49° . . . . . . . . . . . 45°

Camshaft
Material . . . . . . . . . Grey Cast Iron
Camshaft Bearings . . . 5
Bearing Clearance . . .. 0.05 to 0.09 mm
Journal Diameter . . . . 34.0mm
End Float . . . . . . . . . 0.10 to 0.20 mm
Camshaft Bend . . . . .. 0.02 mm or less
Height of Cam Lobe Inlet . . . . . . . . . . 42.18 mm . . . . . 42.50 mm
Height of Cam Lobe Outlet . . . . . . . . . 42.25 mm . . . . . 42.56 mm
Nominal Cam Lift . . . . . . . . . . . . . . . 10.0 mm . . . . . 10.5 mm
Rocker Arm to Rocker Shaft Clearance_____0.013 to 0.043 mm

Don't forget that the US had the Starion (Conquest) having the 2.6L astron engine so your cam could be a turbo cam too. Although looking at the Conquest manual shows the cam being pretty much the came specs apart from about 0.2mm in lobe height.

[woops]

Oh also the part number for that cam is different to any of the sigma part numbers.

The sigma ones are from the genuine parts manuals are:

2.0L Astron 1 4063324
2.6L Astron 1 4151130
2.6L Astron 2 AD077306

Note: These are the numbers for just the cam shafts so if it was in a kit it could be different. Also a quick google search shows a whole heap of Chinese manufacturers of the product and I have no idea where the part number would be originally from. It seems maybe to be from a pajero from the looks of it.

[Xaser]

I don't know if this will help you at all but here are the cam specs for the Sigma GK Astron NA model. I think it would be for the astron 1 head but it could be the 2 because they don't state a second version type. I think the GK had the astron 1 and then got the astron 2 partway through the run but I'm not positive. Well the compression ratio is for a 8.2:1 so whatever engine that is for.

Valve timing . . . . . . . . 2.0L engine . . . . . 2.6L engine
Inlet Opens. . . . . . . . . 24° BTDC . . . . . . . 25° BTDC
Inlet Closes . . . . . . . .. 64° ABDC . . . . . .. 59° ABDC
Duration . . . . . . . . . .. 268° . . . . . . . . . . 264°
Exhaust opens . . . . . .. 59° BBDC . . . . . .. 64°BBDC
Exhaust Closes . . . . . .. 25° ATDC . . . . . . 20° ATDC
Duration . . . . . . . . . . 264° . . . . . . . . . . 264°
Overlap . . . . . . . . . . . 49° . . . . . . . . . . . 45°

Camshaft
Material . . . . . . . . . Grey Cast Iron
Camshaft Bearings . . . 5
Bearing Clearance . . .. 0.05 to 0.09 mm
Journal Diameter . . . . 34.0mm
End Float . . . . . . . . . 0.10 to 0.20 mm
Camshaft Bend . . . . .. 0.02 mm or less
Height of Cam Lobe Inlet . . . . . . . . . . 42.18 mm . . . . . 42.50 mm
Height of Cam Lobe Outlet . . . . . . . . . 42.25 mm . . . . . 42.56 mm
Nominal Cam Lift . . . . . . . . . . . . . . . 10.0 mm . . . . . 10.5 mm
Rocker Arm to Rocker Shaft Clearance_____0.013 to 0.043 mm

Don't forget that the US had the Starion (Conquest) having the 2.6L astron engine so your cam could be a turbo cam too. Although looking at the Conquest manual shows the cam being pretty much the came specs apart from about 0.2mm in lobe height.

Excelent Info , but I have a 4G52 ( 2.0) and STD have 9.5 of compression ratio, and 220 of duration ( 0.05'')

SO many models i Think..

This cam have a big Lift, but a poor duration.. in the spec of box says Dodge Challenger
Sapporo 2.6 GJ
Colt Wagon

No one have turbo

Wired cam... i put the next month and post the dynosheet to see.

so many thnks again

[woops]

Yeah the 2.0L engine info i put there should be fine for you as the 4g52 2.0L Astron engines are mostly the same apart from the balance shaft and non-balance shaft versions. And yes the one in the manual i have does have a compression ratio of 9.5:1 so it should hopefully be the same as yours.

[genius]

Lots of the cams were the same. The overlap is always kept to a minimum for smoother idle. Im not sure why you would need to harden your cam anymore than its case hardening unless you were using a stronger spring , which really doesnt seem right in your application. Using a dial indicator and V blocks would let u compare with anything laying around if u have access to that sort of stuff.

[Xaser]

Genius, yeah, i have comparator and Dial Disc.

Also Spring ( doubles ) too.

My ask, is becouse have a few cam of this engine, some by own design, and this, i buy like "new and original cam", but when i mesasured, see the 12mm Valve Lift, the duration are well ( to a Standart Cam) but, the lift are big, becouse that i think this cam are not a original ( Standart Cam)

cheers