grumpy dad
Member
- Joined
- Dec 29, 2015
Hi
penta 16 valve head ?
penta 16 valve head ?
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I only have a decent 530 k-jet head on the shelve atm, no 531 I'm afraid. I do have a b234 head which will need work with a set of matching pistons, but that's waiting for some parts from Sander to be complete.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.
If i were to buy an aftermarket cam again it would also be an ENEM, from what i've heard around here their quality level is top-notch. Some other brands aren't always that focused on quality though which is kinda import for a daily imo.All this talk makes me want to point out this reason for me buying enem cams. New billets so no lash caps needed. The long term quality is well established at least for myself as I have 165k miles on my turbo cam and my n/a cam has about 94k miles on it. N/a is daily and the turbo used to be the daily a long time ago.
I suggested the V16 cam because the duration is about the same as the K cam and you can get turbo low overlap or n/a higher overlap versions of the cam.
Thanks for the extensive feedback, nice to hear other LPG enthusiastsNice project! This is for a daily? When running on LPG the compression ratio can be increased a bit indeed, that won't hurt. Probably gives better fuel economy as well. But i wouldn't go too crazy on the compression ratio because of the increased bore size, that makes the engine a bit more detonation prone, 10.5:1 is a nice target to have a bit of a safety margin.
I wouldn't go too extreme on the cam as well, increasing displacement generally has a tendency to make a 4 cylinder engine run rougher. The V-cam is quite an optimal cam for the 8v head, especially for a daily. With the stock chamber design, going over 12mm lift doesn't really increase flow that much. Longer duration would be the only other option, so maybe go with a K-cam if you want a bit more power in the upper midrange? Going for wilder cams will result in excessive overlap which hurts the (idle) smoothness and drivability of the engine, fuel economy will also suffer. In my opinion that's quite a large trade-off for a (small) bit of extra power in the upper rev range. The 530 head just doesn't flow that much in stock form.
My advice would be to at least clean up the valve bowls if you want to leave the head stock-ish and drop in a V-cam or a K-cam. Aftermarket cam quality can be a gamble especially when going for the cheaper stuff. Since you've already got a V cam lying around, i would use that and put the money into bigger valves. This makes the head more suitable for the larger displacement instead of applying a wild cam band-aid. I'm currently running a ported head with 46/38 valves on my B230 turbo engine and even with a T-cam i'm having quite a broad powerband with great drivability. The KLRacing stainless valves aren't that expensive and come with a chrome coated valve stem so they can be used with the stock valve guides. It will require some time and machining though to make them fit and to modify the ports/combustion chamber to benefit from the flow capabilities of the larger valves. I'm using them with the stock valve seats by the way, no problems after about 10k km's yet with 18~21psi boost and LPG.
Swap it with someone with a 405 head?Any you boys has a tutorial how one makes k-jet holes in a 531 heads?
Had some calculations done and looks like really in desperate need of a better flowing head. So I bought myself a 531 head.
Don't tell me I also need larger intake valves?
I wouldn't go too extreme on the cam as well, increasing displacement generally has a tendency to make a 4 cylinder engine run rougher. The V-cam is quite an optimal cam for the 8v head, especially for a daily. With the stock chamber design, going over 12mm lift doesn't really increase flow that much. Longer duration would be the only other option, so maybe go with a K-cam if you want a bit more power in the upper midrange? Going for wilder cams will result in excessive overlap which hurts the (idle) smoothness and drivability of the engine, fuel economy will also suffer. In my opinion that's quite a large trade-off for a (small) bit of extra power in the upper rev range. The 530 head just doesn't flow that much in stock form.
So!
Was going through Marktplaats and happened just to find a complete standalone kit with throttle bodies, lpg en gasoline fired.
Now only one needs to decide will I use it for the B25 amazon or for the B300 245.
Anyhows, I already have a set of 48mm dcoe webers ready with Lpg mixers.
So either I will use the TB's or the webers for the 240.
Decisions...
The TB's are 45mm so guessing the TB's for the amazon and the webers for the 245?
Also cozzz the standalone kit is originally made for b20. Maybe the best way to go.