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3.0litre stroker crank set, k-jet fueled?

T

TurboDutch

Active member
Joined
Aug 5, 2019
Location
Nieuw en Sint Joosland
Morning gents,

Found the 3L stroker crank set in the NL.
Was thinking to use it in my pistonslappy B230E, so it is using K-jet.
Using LPG as main fueling, looking into getting larger size venturi mixer but that shouldnt be to difficult.

But actual question will be will my K-jet dig this shit?
Like to use it NA powered, probably has been done before anyone has experience in this? What to expect?

Will be using 530 B230E head, will try to get some sodium filled exh valves in there from a B21ET head.
Maybe do some unshrouding.

Deck will be lowered a bit, total compression ratio should end up around 1:10 or if the head is warped will need to skim a bit more. Maybe 1 :10.5.

So what can I expect from this upgrade using N/A 3 liter stroker with 530 sized head and K-jet?
And will my K-jet be able to fuel the extra 0.7 litres? Any adjustment needed?

Stroke kit source;

TinusTuning, classic volvo motors & parts. Strokers en speciale krukassen

www.tinustuning.nl www.tinustuning.nl
 
1. K-jet on this is a waste of time. Period !
2. Power output will depend on head work and camshaft if all else is sufficient.
Stock 530 will probably give you a lot of torque down low and disappointing power on top (maybe 140-150 engine HP ? )
 
K-jet is only secondary or back up fuel just need to be able to get to the gas station again after my LPG 100ltr tank is empty.

Stock cam will be V cam in B230E should be not too bad right?
Stock B230E already has 130hp.

Been reading a bit in the NA performance section, valves sizes should be fine.

Car already has a 4 2 1 headers and 3inch exhaust.

So I will be looking in some unshrouding of the head and some combustion chamber mods.
Maybe anyway shaving some of the head to get somewhere to 1:10.5 compression.
Will also be unshrouding the K-jet intake manifold a bit.

I think somewhere about 170hp should be possible, with good torque.
While keeping the V cam.
 
You may need to source a larger fuel distributor from something in the 3L range, as you may max out the fuel flow capabilities.
k-jet is generally ok with most things, and seems to adapt well. I’ve never seen someone increase displacement 30% with one though.
Initially thoughts: it’ll work just fine if you’re not reving the engine to extremes. I’ve used it on a 2.3L that would rev over 8k rpm. So it may actually be adequate fuel flow.
 
You really need to do some research into kjet basic operation

Kjet was used on anything and everything back in the day. I would imagine a good Porsche forum (good luck) would have your answers

It’s all about fuel management with kjet Larger displacement will need more fuel
 
TurboDutch said:
Thanks man! I still have some B21ET kjet wondering around. Would that give any increase? Or is it same?
Click to expand...
I'm not sure of the fuel flow capabilities of the b21et k-jet distributor. I just used the stock b21 naturally aspirated one.
A 2.3L engine at 8k rpm moves more air than a 3L engine at 6k rpm. The higher reving engine will have less volumetric efficiency, but I don't see that being much of an issue for your engine build.

With using LPG, going to the sodium filled turbo valves will be a good idea.
Your compression ratio should be fine, the 2.3 was 12:1 and had a great fuel curve.
 
The K jet should take to it ok, might run out of capacity at the top end. As it is only for backup then not a issue

I would not put too much effort into the sodium filled valves but they would not hurt.

As you are running LPG there is a lot to be said for converting to LH2.4 and run an injection system. The consumption is a lot better than being on a mixer system.

Remember with the increased displacement that is going to bump the CR up on its own. Cam wise a 3ltr is going to see the V like 2.3 does a M cam so something with a bit more lift and duration would not be a bad idea.

Do you already have something in place to alter the ignition timing like a 123tune?
 
Static compression ratio discussion (12:1 as above) is irrelevant and meaningless without considering DYNAMIC compression ratio which is the only compression ratio measurement that holds any significance

Until you know the timing of the event of the closing inlet valve, you don't know what you're doing
 
hessam69 said:
Static compression ratio discussion (12:1 as above) is irrelevant and meaningless without considering DYNAMIC compression ratio which is the only compression ratio measurement that holds any significance

Until you know the timing of the event of the closing inlet valve, you don't know what you're doing
Click to expand...

How about 12:1 with a k-cam.
Feel better now?
 
I would suggest a cam somewhere around the area of a V16 enem n/a cam. A 3 liter engine will really use the extra lift and duration without becoming too wild. The fuel distributor from the B21ET should be enough extra fuel to give you some more top end power than the stock B230E one. Just not sure if you can fit it in there next to the block.
 
TurboDutch said:
I might just go to 11.5 to 1 during the process. Thanks again!
Click to expand...
Careful with high CR and a smaller camshaft like a M or T. When you're out of propane the gasoline setup will most likely ping/detonate with a smaller camshaft. A B cam at a minimum is where I'd start, preferable something much larger depending on your goals and use for the car.
 
classicswede said:
The K jet should take to it ok, might run out of capacity at the top end. As it is only for backup then not a issue

I would not put too much effort into the sodium filled valves but they would not hurt.

As you are running LPG there is a lot to be said for converting to LH2.4 and run an injection system. The consumption is a lot better than being on a mixer system.

Remember with the increased displacement that is going to bump the CR up on its own. Cam wise a 3ltr is going to see the V like 2.3 does a M cam so something with a bit more lift and duration would not be a bad idea.

Do you already have something in place to alter the ignition timing like a 123tune?
Click to expand...

Thanks for the replies all!

So yes I had been doing some thinking too about stuff :p
I will stick with the mixer because of it's simplicity I like it.
About the increased displacement, because it is a whole kit the CR remains, so it is even quite low as it is.
I like to see somewhere minimum 10.5:1 and max 11:1 I guess.
So I am always able to use ron 98 (eu) pump gas if needed or no LPG available.

Then yes I get the bigger cam, so it means I need to go the whole shebang right.
So I have some 38mm stainless exh valves coming and I will be looking into some head work.

A cam is quite easy to change so I won't (at this moment) be ordering it like yet, but knowing myself I will.
But I was looking into KL racing T5 seems a fair amount of lift and duration, looks like a good NA cam.
It says you cant drive to work with it? How about grocery shopping? That allowed?

shop.klracing.se

Volvo 8v kamaxel KLR S/T5

KLR 5 Kamaxel lämplig för olika former av motorsport som Rally, Racing osv Går ...
shop.klracing.se

T3 cam also seems quite oke?

shop.klracing.se

Volvo 8v Turbo kamaxel KLR T3

KLR T3 Har mer lyft än T2 och ger lite orolig tomgång, passar motorer med lite högre ...
shop.klracing.se

But I like the idea of a cam that says not to be used to drive to work with :p

I has been thinking about the ignition indeed, but with the K-jet engines it is controlled by some computer ish thingy right?
Does anyone have specs on advance curves? I was thinking to keep it honestly :p

culberro said:
Careful with high CR and a smaller camshaft like a M or T. When you're out of propane the gasoline setup will most likely ping/detonate with a smaller camshaft. A B cam at a minimum is where I'd start, preferable something much larger depending on your goals and use for the car.
Click to expand...

It is a B230E so currently using V cam. But yeah as mentioned above I am already considering something bigger.

Harlard said:
OP, sell it to me
Click to expand...

Patience :-P these kind of things happen more often.
I am also selling my B22
 
For a stroker motor a KG9 would be well suited:

In terms of head work, you might want to start with a 531 for a bit more play until you hit the coolant channels. There are several good resources on porting on here, but it might actually be more cost/time effective to drop it off at tinus or some of the swedes. KG offered a buildt head for SEK 32000 with cam and valves last time I checked.

K-jet came with a K-cam in some versions IIRC, so getting one of those might be an option if you can find the matching ecu.
If you need some LH2.4 stuff, let me know, I'll help you get set up. I still owe you one for the cheap 18t and the lsd deal;)
 
Swedbrick said:
For a stroker motor a KG9 would be well suited:

In terms of head work, you might want to start with a 531 for a bit more play until you hit the coolant channels. There are several good resources on porting on here, but it might actually be more cost/time effective to drop it off at tinus or some of the swedes. KG offered a buildt head for SEK 32000 with cam and valves last time I checked.

K-jet came with a K-cam in some versions IIRC, so getting one of those might be an option if you can find the matching ecu.
If you need some LH2.4 stuff, let me know, I'll help you get set up. I still owe you one for the cheap 18t and the lsd deal;)
Click to expand...
Hey Heime!

Thanks for the reply! So I really want to stick with simplicity I am into carbs and little electronics since I have my amazon.
I still do M44 tuning but for my 240 and amazon I want to stick with carbs and k-jet simplicity.

I really like the KG09 cams yes but they dont have any KG cam in stock as it seems, it looked like KL T5 was a worthy replacement.
But I am not in a rush to buy cams yet, since the engine still needs to be bored and decked.

If you could hook me up with a 531 head for reasonable moneys I would be glad, but there is not much for sell at the moment.
I have had a 530 head done earlier by Jelmar, and recently done a couple of B20 heads myself, don't see any reason to have someone else do it.

So I am open for cam options :p (with availability in stock :) )
 
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