Recent content by ZoRG

thanks!

Hi I am not in the US, but they were sent there first of to the head porter, there were no import duties on the valves, but it was before November 2004. The quality is very good. Have a look at the site : http://www.titanium-valve.com/english/index.htm, the price with shipping was around $685...

I struggle to find any good books on sequential transmissions, can anyone start me off at a good place?

http://www.cunninghamrods.com Had a quick look, the Russian Ti has a elastic modulus of around 139-142 vs +-114 for all other grades available, this could mean a considerably lighter rod than previously possible.

The forged ones are 4340 chrome moly, Titanium can be good, a tip if you are having your machined could be to use a titanium top with a steel bottom, then make the bottom .25mm wider on each side. As for Carillo, they make I-beams. Cunningham also makes some of the best rods around, and also...

They are all expensive :( Colsibro is the cheapest afaik, then Trojan, then CB I think trojan and CB are about the same, they don't differ by that much in raw form. Colsibro is not compatible with titanium though. And if your head porter doesn't have a respirator, go with trojan.

From Columbia metals since they are a supplier of these. Hardness: TROJAN : HB200Minimum 230-270Typical Copper Beryllium : HB180 Colsibro : HB200 COLSIBRO is a Copper Nickel Silicon alloy which offers a remarkable blend of properties at a non exotic price.

No no, thats the drum, I am talking about the gear lever mechanism, it can ratchet both forwards and backwards.

The F1 cams I have seen were all single lobes.

Does anyone have any sliced views or animations explaining how a bi-directional ratchet typically used in a sequential gearbox works?

F1 problably use Ti as the hats, although, I would think Aluminium would suffice. To be honest, personally, I still think the only way to go for a street car is carbon/ceramic, it might be difficult to find some currently though, but the cost would be the same if not cheaper than the titanium...

Gerotor pumps have higher vacuum, and also allow for higher rpm, they don't cavitate as early as gear pumps. As for volume/pressure vs size, I think the Gerotor is slightly more compact as well. But not 100% sure.

No problem, it will be some time though, we have had some unfortunate badluck with a sudden death of one of our suppliers and are currently spending alot on screw machines to bring the work inhouse, so we will problably only move towards this early next year. Regards, Jonathan.

Can you do your own machining?

Not sure, if you want long life, go with silicone bronze guides, the material is cheap as well... Manganese have better performance with acceptable wear, the material is also cheap, we will be doing a run 30 or so sets of Manganese guides soon. Beryllium/copper is very expensive, if you wont be...