3rd Accord Gen Camshaft Differences (A16, A18, A20, B20)

[forrest89sei]

Here Is Some Decent Info About the Various Camshafts That Are In Our Motors From The Factory:

A Series

A16 (Europe & Others): Intake: 38.175/Exhaust: 37.776

A18 (Japan & Others?): Intake: ?.???/Exhaust: ?.??? If you have this info Please Post it

A20A1/BS (North America): Intake: 38.477/Exhaust: 38.353
A20A1/A20A2 (Europe/Japan/Others): Intake: 38.541/Exhaust: 38.607

A20A3/BT (1986-1987): Intake: 38.604/Exhaust: 38.796
A20A3 (1988-1989): Intake: 38.731/Exhaust: 38.796

A20A4 (Canada?, UK, And Others) (1986-1989): Intake: 38.858/Exhaust: 38.796


B Series

B18A (Japan & Others?): Intake: ?.???/Exhaust: ?.??? If you have this info Please Post it

B20A2 (Goldtop) (Europe& Others): Intake: 33.676/Exhaust: 33.737
B20A8 (Blacktop) (Europe & Others): Intake: 37.716/Exhaust: 37.781
B20A (Goldtop) (Japan): Intake: ?/Exhaust: ?
B20A (Blacktop) (Japan: Intake: ?/Exhaust: ?


* All Information is Furnished By Honda Factory Service Manuals

[forrest89sei]

Can a Mod Fix the title, i was tired when i Wrote it, it should be:

3rd Gen Accord Camshaft Differences (A16, A18, A20, B18, B20)

[Nafs Asdf]

B20A2 and B20A8 are EDM, the JDM ones (both black and gold) I think are just B20A's.

[forrest89sei]

B20A2 and B20A8 are EDM, the JDM ones (both black and gold) I think are just B20A's.

Yeah Your Correct, I need a JDM Service manual!

[A18A]

Correct

[Bass Man]

Awesome info!! Well needed...

I'm gonna ask my JY if they have any 88-89 LXi cams next monday, and hopefully I will have a beefcake CHEAP cam!

[forrest89sei]

Awesome info!! Well needed...

I'm gonna ask my JY if they have any 88-89 LXi cams next monday, and hopefully I will have a beefcake CHEAP cam!

Cool After seeing your post I figured it's needed

[Bass Man]

Good thinking ;)

[Nafs Asdf]

Hmm, what's with the huge differences on the B20A2 and A8?

I thought the two engines were pretty much the same, just with the A8 having emissions components and 9.3:1 compression instead of the B20A2's 9.4:1 (or was it 9.5). Hence the slightly bigger power output of the A2.

[forrest89sei]

Hmm, what's with the huge differences on the B20A2 and A8?

I thought the two engines were pretty much the same, just with the A8 having emissions components and 9.3:1 compression instead of the B20A2's 9.4:1 (or was it 9.5). Hence the slightly bigger power output of the A2.

Honda Being Weird I Reckon?

What I don't get is the A8 having such a more aggressive cam and still losing 15 HP!

I know emissions kills HP but not that much

[Nafs Asdf]

I checked the compression ratios from the shop manual, I was almost right. It's 9.5:1 for the A2, and 9.4:1 for the A8

Also I think that both engines might have the same cams in the 88-89 models.

And where did you get the 15 hp difference from? o.O
The B20A2 is 142 hp and the B20A8 is 133 hp (using wikipedia as reference) . With the differences between the two being compression ratio, catalytic converter and egr.

[Vanilla Sky]

Those old 80's catalytic converters sucked.

Were the manifolds different? What about the computer? I can see those both having a significant effect on the power.

[Nafs Asdf]

Yeah, the exhaust manifolds are different. B20A2 has a 4-2-1, and the B20A8 a 4-1.

Don't know about the ECU

[Vanilla Sky]

At least in the states, the 4-2-1 had 2 oxygen sensors, thus requireing honda to have a different computer for the extra input.

[Kagato]

bump for great justice, and great information

[Nafs Asdf]

That B20A information should be fixed tho.

[forrest89sei]

That B20A information should be fixed tho.

as soon as i have jdm info i will gladly :wave:

[Nafs Asdf]

You could make it read Europe instead of Japan tho ;)

Also, as I said before. I think both engines have the same cams 88-89 but that the 87-86 versions of the A2 might have the smaller one. Anyone know any better about this?

[forrest89sei]

Here Is Some Decent Info About the Various Camshafts That Are In Our Motors From The Factory:

A Series

A16 (Europe & Others): Intake: 38.175/Exhaust: 37.776

A18 (Japan & Others?): Intake: ?.???/Exhaust: ?.??? If you have this info Please Post it

A20A1/BS (North America): Intake: 38.477/Exhaust: 38.353
A20A1/A20A2 (Europe/Japan/Others): Intake: 38.541/Exhaust: 38.607

A20A3/BT (1986-1987): Intake: 38.604/Exhaust: 38.796
A20A3 (1988-1989): Intake: 38.731/Exhaust: 38.796

A20A4 (Canada?, UK, And Others) (1986-1989): Intake: 38.858/Exhaust: 38.796


B Series

B18A (Japan & Others?): Intake: ?.???/Exhaust: ?.??? If you have this info Please Post it

B20A2 (Goldtop) (Europe& Others): Intake: 33.676/Exhaust: 33.737
B20A8 (Blacktop) (Europe & Others): Intake: 37.716/Exhaust: 37.781
B20A (Goldtop) (Japan): Intake: ?/Exhaust: ?
B20A (Blacktop) (Japan: Intake: ?/Exhaust: ?


* All Information is Furnished By Honda Factory Service Manuals

Ok Updated