Hello Takaharu SEKI !! Please read :P

[toysrus]

Hello Takaharu,

Can you read this and correct any mistakes >

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The 'Cyclone' & 'Siruis' DASH standard compression ratio is 8.5:1

The Intercooled DASH engines where unofficialy known as the DASH 2.

1984: FWD 'Sirius' (Japan Galant) / 'Cyclone' (Tawain Galant) DASH Engine, non-intercooled running the TC## turbo, some confusion to whether it was the TC05 or TC06......power output was 149Kw.

late 1984: 'Siruis' release Intercooled DASH engine, (DASH 2) Rwd for the Japan GSR Starion, 155Kw, turbo is said to be TD05-12A or TD05-12B and had a small intercooler.

early 1985: 'Cyclone' Intercooled DASH, 155kw for FWD vehicles, released in the Taiwan Galant/Eterna models. Running the TD05-12A or TD05-12B turbo and small intercooler. Sirius also release the FWD 155Kw Intercooled DASH Engine but in Japan, in the Mitsubishi Eterna running the TD05-12A or TD05-12B turbo and small intercooler aswell.

late 1985/1986: 'Cyclone' release the Intercooled DASH Engine, Fwd/Rwd in the Japanese Galant & Eterna and some Starions, with the TD05-12 Turbo trim 'G', with a larger Intercooler and power output at 170Kw/228Ps/230Hp.

early 1987: 'Sirius' produced the 170Kw 'FWD' Engine with the larger intercooler and 'G'-Trim TD05-12 for the VX Eterna.

late 1987, 1988, 1989 'Sirius' then produce the 170Kw DASH Intercooled engine for the Fwd/Rwd Japanese Galant and Starion GSR-Vs', using the larger intercooler and TD05-12 Trim 'G' Turbo.

In 1988/1989 The Eterna 'Sirius' Engine was downgraded to 170Ps ~ 130Kw, unknown Turbo, unknown intercooler.

Also the TD05-12A & TD05-12B Turbo's have the letters 'A' or 'B' on the compressor cover along with the TD05-12......where the 'G' Trim TD05-12 Turbo is shown as just TD05-12 on the compressor cover.


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Can you also write anything else you know about the different DASH engines and the specifications of each different DASH Engine ?

Thanks Takaharu

[toysrus]

..........

[Takaharu SEKI]

Hello toysrus,

Standard compression ratio for "Sirius DASH" or "Cyclone DASH" are all 7.5:1
There is no name such as DASH 2 engine, the name "Sirius DASH" or "Cyclone DASH"do not change even intercooled engine. There is no differences between FWD Galant's Sirius and Cyclone, the reason for why these are named differently are merely because of different production years.
Turbocharger is TC05-12A. No compatibility between RWD and FWD Turbochargers.

More later,
Takaharu

[toysrus]

The area around the valves in the cylinder head is less than the area in a DOHC Engine and because the pistons in the DASH engine are DOHC pistons, how can the compression ratio be 7.5:1 ?

Also when I did a compression test on my 'Cyclone DASH Engine', I got 165psi which should mean the standard compression ratio is about 8.5:1 ...................

The 'Sirius DASH' and 'Cyclone DASH' have the cross-over pipes which go away from the Turbocharger which means that some were Factory Intercooled, correct ?

[toysrus]

................

[Cookiemonster]

Also when I did a compression test on my 'Cyclone DASH Engine', I got 165psi which should mean the standard compression ratio is about 8.5:1 ...................?

How do you equate 165psi to 8.5:1 compression?

[toysrus]

171psi = 8.5:1 CR
149psi = 7.5:1 CR

The GENUINE Mitsubishi manual says so, so call them up and argue it about it with them if you don't believe it :P

Now, because I had the cylinder head pressure tested, 3 angle valve cuts and it clean spic an span, I'ld say its about 162-164psi in reality due to pistons still being carbon black when I put it back together. Plus the fact that the piston rings in a 20yr old thing can't be perfect so 8.5:1 is about spot on.

[NXTIME]

So what does 125psi on all 4 cylinders mean then?

[Cookiemonster]

The GENUINE Mitsubishi manual says so, so call them up and argue it about it with them if you don't believe it :P.

Geez... so defensive. All I asked was where your getting those figures from.

How did you measure your compression?

[ProZac]

This has been discussed before, but the out-come was that it is nigh-on impossible to get an accurate compression ratio from just a compression test. Someone posted a link with a good explanation as to why. I remember because i was asking the exact same question you were Toys. My 8v non-intercooled 1983 starion scored 160-165 across all 4 pots, and the specifications for it say its 7.5:1.

[Cookiemonster]

Here's the article:

http://www.pumaracing.co.uk/comp.htm

[ProZac]

Bingo, cheers bra.

[toysrus]

I'm in a defensive mood today that's all :D

I used a standard compression gauge. Assume, I didn't for arguments sake......

The DASH bottom end runs the DOHC pistons which in the Galant-VR4 was 7.5:1. Now the area in the DOHC head is much greater, about 30% greater than that in the 12V head so asumming the pistons used in the DASH were the 7.5:1 spec'd DOHC ones, than it makes sense that the CR on the 12V would be about 8.5:1

Furthermore, when I questioned 'Fours n More Automotive' here in S.A about the CR of the DASH Engines, he told me they were 8.5:1, I then asked if he had had the head cc'd to double check and he said yes. He even knew that there were three variations of the standard TD05-12 turbo on the DASH Engines, so I see no reason for him to just say it has the 8.5:1 static CR unless it's the truth. Btw, they are the biggest 4 cylinder engine conversion shop here in Adel, he in particular has worked on DASH engines for about 10years now, he even pointed out exactly how the DASH bottom end isn't the same as the Vr4 one and that the only similarity was the pistons themselves.

[toysrus]

Hey Takaharu,

Can you explain more of the differences ? I was told the Intercooled Siruis/Cyclone DASH produced 170Kw/228ps/230Hp ?

Thanks

[Takaharu SEKI]

Hello again,

RWD SIRIUS DASH's output power is known officially 200ps and this is called "gross" power come from an engine itself. At present, indication of horse power is called "net" and it is same as output power at rear wheel. And if this number is converted to "net", RWD SIRIUS DASH power is shown as 175ps.
In Japan, only G54B　2600cc is with TD05-12A TURBOCHRAGER and others are all with TC05-12A. Also, FWD GALANT and Lancer Turbo(non-intercooled) are with TC05-12A but these compressors are smaller.

Yes, as you say, DASH Engine pistons look like DOHC Engines'. To compare DASH Engine pistons and standard 8-valve engine pistons, DASH pistons have bigger hollows. Since the 8-valve engines were intercooled, the compression ratio became low as 7.5:1 and these are followed to DASH Engines.
FWD GALANT DASH Engines are intercooled, but I have never seen the real one, so I can not compare it with Starion's engine.
FWD GALANT Engine intercooled shows same gross 200ps (net 175ps) as RWD Starion.
In Japan, we do not take the compression test for getting the compression ratio. Thinking of carbons are piled up, we can not get the calcuration of ratio precisely.
What we do is, take out the sylinder head, put glass plate on the compression chamber and piston top, then pour engine oil into. From the amount of oil and thickness of sylinder head gasket, the compression ratio will come after calcuration by officially approved formula.
Depends on what tuning is required, adjustment will be done by after-market sylinder head metal gasket.

If all correspondence are in Japanese, I could answer you like echoes.........