Cathar I know you have a bike racing background . Mine is in auto racing . I spent 4 months in hospital with the hurtin .

I have a question for ya . I really like the PA 160's . Pound for pound I consider them the world champs.

In racing cars we use resticters in 700hp+ engines to cool them without the resticters they over heat.
I have found On a single 160 that a lot of flow threw them isn't as good as a metered flow it seems that about 3.2 gpm is the most efficient for single application . But if you use 2 or more in series than higher flow is required.

So I have 2 questions do you restict the flow on your racing bike.

Have you tried 160's in series and what were your results.

By the way a read the [H] forums thread on tube sizing . I am vary sorry TN gave you such a hard time . I like TN have always believed in small tube sizes. The differances between us tho is I understand flow much better than TN . TN has in the past made some good points and I agreed depending on the blocks used. Some of the German blocks back than did infact work very well with small tubes.

I have also always from day one promoted the ideal of using flow control rather than a single loop if more than 1 block is used. I believe if your going to cool with liquid cool everthing and this is were I have run into problems. Biggest problem is the pumps . Getting a pump that flows 8-10gpm thats also quiet is hard and does not dump to much heat in the system. As you well know. With your background I know that you understand the problems I have gone threw trying to get the perfect combinations required to accomplish my goals. I had to build a box to mount the dual pump system in and suspended them and use sound absorbing material inside the box. with air ducting for a little flow over the motors.

With your experiance could you tell me what pumps you would use to achieve 8-10gpm flow that are 12v or 24v . You already know the 3 pumps I am working with a little insight from you would be vary helpful.