Jason Moyle Racing

General Category => INDUCTION => Topic started by: tinytim139 on November 06, 2012, 02:21:39 pm


Title: Custom Plenum?
Post by: tinytim139 on November 06, 2012, 02:21:39 pm
Would it be worth making a custom inlet plenum to work with a standard digifant? Thinking of building one for better/smoother air delivery as i recon with tubing and such could build for around 50 quid. Any thoughts or ideas would be great. Engine it is for is a 1.8 stage one head with piper 270 cam (want a "nippy" reliable road car).

Thanks in advance Tim.
Title: Re: Custom Plenum?
Post by: JMR on November 07, 2012, 10:33:46 am
Hi Tim

Not really at the power level your looking at as the std plenum is fairly good, with actually little flow loss. A custom plenum will end up a very similar result for a lot of effort.

A stage one type head and Piper 270 should make around 130-135 without to much trouble on an 1800 bottom end with a decent exhaust system...closer to 140hp is possible if the airbox is modded and a tubular type manifold is used.

Peak numbers are less important really for a road engine as you want good low-mid range grunt which the above should provide.
Title: Re: Custom Plenum?
Post by: chrismc on November 08, 2012, 09:29:21 pm
The level of headwork is key to releasing the power

For more mid-range the easiest 'fix' is to up the capacity- 2L block!

Flow-work, even hotter cam, 2.5" exhaust etc will all aid top end breathing & tend to make it more revvy...
Title: Re: Custom Plenum?
Post by: Acezenoevo on April 21, 2015, 09:42:44 am
Criticism is wonderful.
Title: Re: Custom Plenum?
Post by: Embernarn on May 20, 2015, 09:23:17 am
Days elapsed time has taught many things.
Title: Re: Custom Plenum?
Post by: Bornjames on October 07, 2019, 11:52:46 am
I think it's worth it.