Bolt-On Rb25Det And Rb20Det Intercooler Kits, What You Guys Think?

[VultureMotorsport]

Hey guys,

We are in the process of designing bolt-on intercooler set-ups for the RB25 and RB20 engines.

We have been told there is not much on the market that doesn't require cutting ect.

What do you guys think about that? Would you be interested in purchasing?

Just trying to gauge some interest so any thoughts are welcome!

[discopotato03]

Hey guys,

We are in the process of designing bolt-on intercooler set-ups for the RB25 and RB20 engines.

We have been told there is not much on the market that doesn't require cutting ect.

What do you guys think about that? Would you be interested in purchasing?

Just trying to gauge some interest so any thoughts are welcome!

I would like to see someone recreate the Trust Turnflow intercooler because there is a demand for them and I think they were discontinued some time back .

In my mind these are the best solution for those that don't want the pipe work going through the inner guard and back over the top of the engine to its inlet pipe . It leaves the engine bay looking totally standard so less for the whallopers to bite you over .

Also if anyone peers in through the front at the tubes all they do see is vertical ones which could be easily mistaken for radiator or AC condenser tubes especially if its black .

As for the vertical tubes , I don't believe it matters to cooling (with the same external area) if the tubes are vertical or horizontal . What would make a HUGE difference is the number of flow paths with vertical tubes because there are so many more of them than you can fit in a horizontal flow core . It stands to reason that the more tubes you have the less flow restriction there is so ultimately the vertical tube core will flow more all else being equal .

The other thing is that we NEED the airspeed through the tubes to be low to give the air molecules more time to reject the heat given in the pumping process . If you don't think this is the case then ask heat exchanger manufacturers why they fill the tubes with "turbulators" and why more thin tubes , to a degree , tend to work better that fewer deeper section ones . The thinner tubes and turbulators force the air/water/etc to slow down and tumble which reduces boundary layer flow . You get better heat rejection AND flow by having more tubes rather than longer tubes - quote Corky Bell .

By comparison a horizontal tube IC of the same dimensions has fewer longer tubes and that long tube to return the air back to the standard nearside plumbing . On the Trust style "Turnflow" the bottom collector tank replaces the return pipe so its all good .

If I was going to make intercolers for R32/33/34 I'd do the Turnflow style and like trust use two suitably sized cores side by side with custom tanks . If suitable core were available it would be quite easy to fabricate and depending on how many tubes you had it may even be possible to have the core a little thinner minimising the reo bar trimming - which most would prefer not to do if possible .

A .

[karma_syke]

what about the number of cooling fins? is there an optimal number/formula? The more the better or at some point would it cause a restriction?