531 vs 405 Head

Rob · 2014-02-06T16:40:12+00:00

http://ozvolvo.org/discussion/458/gumtree-531-head-tas#Item_28 Is that something that I'd want in my car? Would the 531 head be a good fit for my 84?

A_Volvo_Driver

My 531 has k jet holes in in from the factory. I can't wait to drive it with the KG8 cam.

deleted_user_160

k jet holes can be drilled in the head, (the location is still there) so drilling for modern injectors is a possibility also.
i was looking at this route. however have been advised against it

jamesinc

I was going to tap the holes and put bungs in

DCW242

nickm;12374 wroteBit of a side track but, 531 heads are not that rare in Australia most 940's and late model 240's have them.
That would be the most common source.. They are setup for an NA so no sodium valves.
They have a larger combustion camber than the 530.

Yes that's true, but Kjet 531 heads are very rare.

jamesinc;57923 wrote
Forg;17605 wrote
Spac;9188 wroteRealistically, a 531 isn't usable on a K-jet car.
A 1985 240 doesn't have a 531 head, being a leaded engine?
It'll have a 405 head being a B23E

A 1985 240 in Australia will have a B230E.

jamesinc;57985 wroteI was going to tap the holes and put bungs in

That works fine. I think Angus has done that for one of his cars.

jamesinc

I'm pretty sure some of them still had B23E motors in 1985. Could be wrong. Fairly sure my first car, an '85 240GL, had a B23E. Maybe. Hmm.

deleted_user_160

I will do something like that also. Hmmm maybe NOS!!!!!

Dauntless

B230E would've been original for 1985.

Tigabu

So I think we can agree there is an overlap in 1985 of B23/B230E/B230F motors.

Dauntless

I wouldn't have said so.

84 = B23E
85 = B230E
86 = B230F

Tigabu

I would.

The crossover in Aus from year model changes, as many of us know, means there are variables. Can we say with 100% certainty that your 'graph' holds true?

Of the 2 1985 models I've worked on one was B23E and the Other B230F.

I'm not saying I'm wrong, I just know that there are variables in Aus that don't fit in to neat little categories :)

PaddlerEd

What doesn't help is that the Swedes typically did the model year change in about October each year, so whilst it was a 198x built car, it could in fact be a 198x+1 model year car - a bit unlikely due to delivery times, but there is that possibility.

Samman88

Interesting you say NOS @blondejay apparently some of the crazy swedish have tapped the kjet ports for direct port wet nitrous injection / water meth injection setups with great success and then used a conventional manifold with efi injectors.
Would be pretty awesome!

egads (she/her)

And the kit building for local cars also meant that model years can get a bit muddled vs compliance dates.

deleted_user_160

Samman88;58061 wroteInteresting you say NOS @blondejay apparently some of the crazy swedish have tapped the kjet ports for direct port wet nitrous injection / water meth injection setups with great success and then used a conventional manifold with efi injectors.
Would be pretty awesome!

Exactly Sam. I've also thought of the idea for twin injectors and all kinds of stuff. But with how adjustable modern aftermarket ECM are. No need.
And I'm changing to 16v now, so that disappears.

Samman88

Yeah I agree with that. It's just so convenient having them there it's almost a shame not to use them for it! But personally not a huge fan of nitrous, rather just turn up the boost a few psi. And E85 pretty much removes any need for water meth injection. And modern injectors can idle pretty well when they are huge, and if you're going to be making that kind of power you'd probably have an aftermarket manifold anyway.
16v?! Exciting!

240Joe

Tigabu;58035 wrote The crossover in Aus from year model changes, as many of us know, means there are variables. Can we say with 100% certainty that your 'graph' holds true?

Of the 2 1985 models I've worked on one was B23E and the Other B230F.

I'm not saying I'm wrong, I just know that there are variables in Aus that don't fit in to neat little categories :)

And to make it even more confusing I've owned three '84 240s and they've all had a B230E.

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