531 which valves

[str8krewzn]

So i know in Stens racing head he uses 40/48 valves
But is there another combonation smaller, better for drag engines?
Or is 40/48 one of the best combos

[Boosted2003]

KG uses 44/40 on there turbo head

[str8krewzn]

Arent stock exhaust valves 44?

[Boosted2003]

stock intake are 44 i believe

[PetesDustyVolvo]

Arent stock exhaust valves 44?

which would make the intakes 40? no.

[str8krewzn]

44IN
35EX i fink

But would a 44/40 be a better setup or a 40/48
for drag motor?

[Tabor]

call me retarted if you want, but aren't intake valves supposed to be bigger than exhaust? That is what my mech told me one time.

[Stereophile33]

SPM uses a 48 intake and 40 exhaust
KG uses 44 intake and 40 exhaust
stock uses 44 intake and 35 exhaust


what do you mean by drag motor?
Give people an idea of what you want your power to look like?

[John V, outside agitator]

Consider that my little V4 has 44.5mm intake and 38mm exhaust, you moght think a motor 30-40% larger that you want some yank out of might want some valves at least the same size.
Maybe even a bit bigger.

And for a daily driver, leaving a bit more material between the two valves might be prudent.

But 48/40 seems yummy.

[str8krewzn]

Yea thats why i rewrote up top 44IN 35EX

Well ill be using KG cam
531 ported
new springs
for now 300-325whp ill be happy
but later when i get my larger injecters,getreg and equal lenth headers
ill hope for 400-450whp
so i was thinking 48/40 big badass BUT
i Wonder if thats TO big
since other places like KG only uses 44/40
Which seems a little better
but not sure

This wont be a daily driver
Jus a weekend Drag car to KILL ricers
Got my 940 with 310000mi daily driver

(Found CHEAP GAS today only 2.99 YAY :grrr: )

[Morley]

...48/40...

I think that's borderline on a 96mm redblock. Erland Cox talked about how he had to move the head horisontally in order to get enough free space....but perhaps it was 50mm on a B21.


Yeah I'm rambling.

[Boosted2003]

If its going to be a race motor then I would go with 48i 40e


Personally for my street car Im going for 44 40

[str8krewzn]

Well im gettin NEW , new style springs so i guess there a little stronger then the older style sprins does anyone knoe
If they Would they hold ok?
and up to 7000rpm?
(if i make any power up there)

[ShadowofBob]

I went with 44/40 on my daily driver car. The intake doesn't have to be that much bigger since the 531 already flows so well and because the air is being forced in a turbo application. If it's for a NA engine then yes, I'd go for larger intake valves.

[stylngle2003]

Well im gettin NEW , new style springs so i guess there a little stronger then the older style sprins does anyone knoe
If they Would they hold ok?
and up to 7000rpm?
(if i make any power up there)

for a drag motor, you better be making the fattest power right up there around 7000-7500 i'd imagine

[frpe82]

call me retarted if you want, but aren't intake valves supposed to be bigger than exhaust? That is what my mech told me one time.
Like we already heard, the stock intake is 44 and stock exhaust is 35.

In a turbocharged application you don´t need to get bigger intake, only bigger exhaust to get better emptying of the cylinder (better VE).

In a NA engine on the other hand, you might want to balance the intake/exhaust valve size, but I guess it is beneficial to go larger on the intake since the cylinder has to suck the mixture in on its own.

In the case of a NA head/valves as well as turbo charged, this subject about "balancing" intake/exhaust valve size and how to improve flow and VE can really go on forever.
So... I really don´t know much about this, but the small amount of info I have on this makes me think that I am right.

[volvorsport]

48/40 is the way to go , youll need new inserts tho .

bigger valves help at all engine speeds and boost pressure , helping to raise torque .

[str8krewzn]

NEW INSERTS what are those?
Do you mean guides

[MikeHardy]

no he means valve seats. but if your doing all that might as well do the guides too..

i wonder how 46/42 would run for a turbo engine. maybe 48/42

[str8krewzn]

Needs new seats anyway so ill jus tell the machine shop open em up
well im still trying to get the cheapest prices
and i think Sten has the cheapest
but since im doin all the work to my head i guess i mite aswell spend 250bucks more for larger valves

Edit:250bucks for valves:omg: nah i think it can wait my 531 is gettin cleaned, resurfaced, ported, new springs and retainers, and KG2T cam
i think that can get me to 300-325WHP with help of t3t4 turbo

[phillazenby740t]

Needs new seats anyway so ill jus tell the machine shop open em up
well im still trying to get the cheapest prices
and i think Sten has the cheapest
but since im doin all the work to my head i guess i mite aswell spend 250bucks more for larger valves

Edit:250bucks for valves:omg: nah i think it can wait my 531 is gettin cleaned, resurfaced, ported, new springs and retainers, and KG2T cam
i think that can get me to 300-325WHP with help of t3t4 turbo

All this talk about 531 heads, i want one, lol, what cars can i find (that would have been sold in canada) would have these heads, i have a great volvo reckers like 2mins from my place.) Will it easily swap from my 530 head??, will an ipd turbo cam made to fit a 1990 b230ft still work with the 531 head???. Wanna keep my 280 whp project as lowcost and simple as possible

[HRPufNStuf]

OK...What great Volvo wrecker is near your place in Ottawa!! Union?Sports car factory?

No 531 heads ever came to Canada unless they were in a suitcase! Swaps easily for a 530 and yes a 531 and IPD cam work fine together..
If you want to compare 530s to 531s I have pair of 531s and a 530 on the stand/and on the workbench here in Ottawa.(Barhaven)



All this talk about 531 heads, i want one, lol, what cars can i find (that would have been sold in canada) would have these heads, i have a great volvo reckers like 2mins from my place.) Will it easily swap from my 530 head??, will an ipd turbo cam made to fit a 1990 b230ft still work with the 531 head???. Wanna keep my 280 whp project as lowcost and simple as possible

[Boosted2003]

If you port a 531 and 530 head. Is there a big improven to be seen from the 531 after porting?

[Boosted2003]

531 heads also use 32.5mm valve springs while 530 use 25.9


Ferrea makes some blanks valves that one could use.

F0230 E 41 mm Stem Dia 7.96mm 135 mm BLANK 20o Super Flo. DUCATI. Special Alloy (For Exhaust)
F0229 I 47 mm Stem Dia 7.98mm 135 mm BLANK 20o Super Flo. DUCATI. Special Alloy (For Intake)

Stem sizes are perfect for the 531 head, not sure if that combo will work but those are able to work in the 8 valve volvo heads.

[thelostartof]

If you port a 531 and 530 head. Is there a big improven to be seen from the 531 after porting?


not if the 530 is ported right .. the flow of the pathway to the valve/cc is what is different ... if just the cc and ports are opened up then the 531 should still outflow it because of it still havn't that different design of the runners before the valve

[frpe82]

KG of kgtrimning.com has told me that the 530 and 531 head is performing equally when ported to their Stage 2 turbo head.

Stage 2 means: 44mm intake valves, 40mm outlet valves, maximum ported and polished chambers and ports, CR optional.

I don´t know if they are adding material to the head to make the type of ports/runners that is optimal, but I would think so. At least for that price (~$1800)...

[Boosted2003]

Does anyone have cutaway of a 530 and 531 heads?

[1 riktig svensk]

There's a lot more to it than just valve sizes....the pieces gotta jive together too....imagine putting a tiny T2 turbo on a bigblock turbo diesel.....or a massive Holset on a turboe'd 750cc motorcycle......things need to be in proportion to eachother to get a good balance, it's not just a matter of "the bigger the better"......

So i know in Stens racing head he uses 40/48 valves
But is there another combonation smaller, better for drag engines?
Or is 40/48 one of the best combos

[DAW]

On the subject of 531 valves, I'm putting together a 2.5L Penta using a low-pressure turbo for street and autocross use. I'm assuming the exhaust valves in the 531 head are not sodium-filled because the AQ 151 is na, not turbo. Do I necessarily have to switch to sodium-filled valves? Are the Ducati valves mentioned above suitable for turbo use? Are there any sodium-filled alternative oversised exhaust valves I could substitute and so accomplish two things at once if I switch out the exhaust valves? DAW

[1 riktig svensk]

KG has them......

http://www.kgtrimning.com/ventilercom.htm

200/700/900-ser motor: B19/21/23/230 saltkyld. 1975- 4801R 48 265:- 3860 38.6 865:-

38.6mm exhaust valve is over $100.....each!!!!

[Boosted2003]

On the subject of 531 valves, I'm putting together a 2.5L Penta using a low-pressure turbo for street and autocross use. I'm assuming the exhaust valves in the 531 head are not sodium-filled because the AQ 151 is na, not turbo. Do I necessarily have to switch to sodium-filled valves? Are the Ducati valves mentioned above suitable for turbo use? Are there any sodium-filled alternative oversised exhaust valves I could substitute and so accomplish two things at once if I switch out the exhaust valves? DAW

They are stainless steel. Should do just fine.

[mikep]

531 heads also use 32.5mm valve springs while 530 use 25.9

Not usually. 530 has the same spring most of the time. The small ones are more likely to be on a 160 or a 398.
BTW, small springs can be the same rate yet much lighter, but that's another story.

[Boosted2003]

Not usually. 530 has the same spring most of the time. The small ones are more likely to be on a 160 or a 398.
BTW, small springs can be the same rate yet much lighter, but that's another story.

Well according to vadis. The b230f, ft, and b200et had smaller springs.

But they could have messed that up. I could see the b200 heads having smaller springs.

[MikeHardy]

B200's used 530's just like everything else. nothing different

[DAW]

Thanks for the tip Boosted2003, I checked out the Ferrea catalog...I've never bought any blank valves, does the machinist cut the groove for the keeper using the stock valve for reference? What is the maximum oversize I can go on the exhaust valve and still have the stock seat ground (vs replaced with larger seat)?

I didn't see a price list. I'll contact them Monday, but do you have an idea how much the exhaust valves you mentioned cost? I know I can't afford the $100/each for the Ventilers from KGTrimning. DAW

[Boosted2003]

Thanks for the tip Boosted2003, I checked out the Ferrea catalog...I've never bought any blank valves, does the machinist cut the groove for the keeper using the stock valve for reference? What is the maximum oversize I can go on the exhaust valve and still have the stock seat ground (vs replaced with larger seat)?

I didn't see a price list. I'll contact them Monday, but do you have an idea how much the exhaust valves you mentioned cost? I know I can't afford the $100/each for the Ventilers from KGTrimning. DAW

Im not sure how large of exhaust valve you can go before u have to put new seat in.