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Old 11-26-2020, 11:58 AM   #1
spock345
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Default Differences between B18D versions

Does anyone know the difference between the 95hp and 100hp B18D motors? I have tried looking through the spec sheets and I am not sure what the difference is.

Is it a dual port exhaust manifold over the single port? Different needle in the SUs?
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Old 11-26-2020, 01:38 PM   #2
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I think it’s a cam change.

AFAIK, the dual port exhaust manifold on B18’s only came on the B18B, for the 1800 series, and the 123GT.

http://www.volvoamazonpictures.se/po...powertrain.php

As I recall the early P1800 with B18B motor was 100hp.

Last edited by c1800; 11-26-2020 at 01:52 PM..
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Old 11-26-2020, 01:56 PM   #3
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A standard 67 122S model would have the dual down pipe cast iron manifold. It is the main reason the power went up a bit without any other changes.
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Old 11-26-2020, 02:28 PM   #4
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Quote:
Originally Posted by dl242gt View Post
A standard 67 122S model would have the dual down pipe cast iron manifold. It is the main reason the power went up a bit without any other changes.
You are correct. My error.

From this website for 1967, “ Engine improvements through new carburetors, new airfilter, manifold (with twin outlets) and front part of exhaust pipe”.

http://www.volvoamazonpictures.se/mo...modelyears.php

Last edited by c1800; 11-26-2020 at 02:35 PM..
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Old 11-26-2020, 06:55 PM   #5
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The new carbs were the change from two bolt air filters to three bolt air filters.
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Old 11-27-2020, 05:43 PM   #6
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Quote:
Originally Posted by dl242gt View Post
The new carbs were the change from two bolt air filters to three bolt air filters.
What is the reason for going to the three bolt filters? Do the two bolt ones like to leak? My HS6s are both two bolt setups.
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Old 11-27-2020, 06:30 PM   #7
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Quote:
Originally Posted by spock345 View Post
What is the reason for going to the three bolt filters? Do the two bolt ones like to leak? My HS6s are both two bolt setups.
It's a taller air filter that flows more air. By then the B18B was up to 115hp. So they added a bit more aiflow since the engines were also using that dual outlet cast manifold.
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Old 11-27-2020, 07:39 PM   #8
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I’ve seen a few references to increased flow as in this link.

Carb CFM Flow Rate

HS6 210
HIF6 240

http://www.mgbmga.com/tech/mgb19.htm
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Old 11-29-2020, 03:02 PM   #9
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The carb is still an HS6 model carb in 67. Volvo HS6 carbs are a performance upgrade for an MGB.
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Old 11-30-2020, 06:30 PM   #10
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Quote:
Originally Posted by c1800 View Post
I’ve seen a few references to increased flow as in this link.

Carb CFM Flow Rate

HS6 210
HIF6 240

http://www.mgbmga.com/tech/mgb19.htm
The B18D never got HIF carbs. Although I doubt there would be a significant difference in performance if you swap HIFs onto a B18D. I plan to try a set of HIF6s from a '72 B20 on my B18D just to see how it runs. I haven't been able to find any information about whether it works well so might as well try it.
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