Dmc vs Volvo engine

[Gruffalo]

Hi!

The euro spec Volvo engine of the era is rated at 156 or 160 horsepower (sources vary).

What exactly is different?

Cams? Exhaust? CR?




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[Delorean Industries]

Mostly exhaust system. Cam profiles between 3/f variations are nominal on power gain. Timing and fuel tweaks along with exhaust rework makes up the difference.

[David T]

The exhaust system on a stock Delorean PRV is awful from a design standpoint. By improving the exhaust system you can make the engine breath a LOT better gaining a good amount of HP before you do any cam work or modifying the induction system. You have one bank of cylinders feeding into the other before both go through the one convertor and muffler. The advance curve for the distributor was never optimized for the Delorean. In fact there is no difference between the auto and the 5-speed! There is a lot of potential there too if you can tweak it. Once you get that done and the motor breathing better with "hotter" cams, some tweaks to the fuel system will provide even more power. This is pretty much the path DMC took with what they call the Stage I and Stage II. From all of the claimed improvement just from the exhaust is some measure of how bad the OEM design really is! Other "Hot Rodder" techniques can also help to improve things a little like porting and polishing the heads, gasket matching, balancing the CC's of each cylinder, blue-printing and balancing, etc. Next step is going full EFI to fine tune things for optimal power and finally positive induction (turbos) with forged pistons. Now your power is up to where you must upgrade the transmission to a single piece input shaft. Each step on this path is expensive but each one leads to the next one in a logical order without "wasting" any parts during subsequent upgrades.

Speed costs money, "How fast do you want to go"!

[MikeWard]

Hi!

The euro spec Volvo engine of the era is rated at 156 or 160 horsepower (sources vary).

What exactly is different?

Cams? Exhaust? CR?
The B28E variant of the PRV as fitted in the european Volvos use higher compression pistons, different model ignition distributor (and different timing), different fuel distributor with larger venturi and different CPR (there is no Lambda system on the european Volvos).

[Gruffalo]

I just got one of those Volvo engines for literally free. Haven't had the opportunity to get a proper look at it yet, but hopefully there are parts on it that can be used to my benefit.


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[dn010]

The exhaust ports suck, at least on the B280F!

[AirmanPika]

It's my understanding that just eliminating the stock cat with a straight pipe (available...may not be legal in your area) helps the most. Not sure of the exact gains though.

[Andrew]

I just got one of those Volvo engines for literally free. Haven't had the opportunity to get a proper look at it yet, but hopefully there are parts on it that can be used to my benefit.


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Wow! Great find! How / where did you score that engine? I'm guessing that you're on the other side of the pond?

Andrew
4194
5052

[Andrew]

It's my understanding that just eliminating the stock cat with a straight pipe (available...may not be legal in your area) helps the most. Not sure of the exact gains though.

The cat and the stock muffler provide a lot of restriction. Thus, speaking hypothetically of course, replacing the cat with a test pipe and a less restrictive muffler will provide a nice improvement in performance.

Andrew
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5052

[Gruffalo]

Wow! Great find! How / where did you score that engine? I'm guessing that you're on the other side of the pond?

Andrew
4194
5052

Correct, old Volvos are plentiful. The engine is in an unknown condition, has been sitting for many years, but came with everything except the distributor.


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[jerzybondov]

Correct, old Volvos are plentiful. The engine is in an unknown condition, has been sitting for many years, but came with everything except the distributor.


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Not quite as plentiful as they were 5 or 10 years ago. I'd say good condition B28Es without galactic mileage or rot are now more like hens' teeth. If you see one, snap it up.

[DMCVegas]

Not quite as plentiful as they were 5 or 10 years ago. I'd say good condition B28Es without galactic mileage or rot are now more like hens' teeth. If you see one, snap it up.

I'll second that. The number of available engines and cylinder heads on car-part.com has plummeted. There are still a decent selection of Z7X-711's & 715's out there, but those numbers have dropped too.