how much air does an engine need?

[Guy Johnson]

Engines are basically air pumps. 

An Atomic 4 with 64 cu in displacement running at 2,000 rpm will need 128,000 cu inches of air per minute. Divide by 1,728 to get 74 CFM. Engines need a lot of air for combustion and then some extra to cool your alternator and other bits that tend to heat up. 

Guy

Puffin 10M #6

[James Keszenheimer]

good insight Guy! So putting an intake fan in that quarter berth opening might be better than sealing it off.

Jim

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[Dave Cole]

Just leave it open.  The engine will pull the air in just fine.  

I removed the cabinet panel in front of my engine.  There is no way to maintain and check the engine with the panel in place.

My panel was screwed in place.

Dave

10M #26

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[James Keszenheimer]

ya, my door doesn’t latch so it’s always open during use and I removed the under sink drawer because of always hitting my head on the wood brackets while under the sink. It still gets pretty hot under there…and smokey in the cabin, but that’s the other story...

Jim

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[Guy Johnson]

I've kept my engine panels in place, but I did make them easier to remove. I used rivnuts to make permanent threaded holes in the cabinets and fiberglass attachment points. No more dealing with stripped wood screws. 

Here's an example of the fasteners I'm talking about. They come in a wide range of materials and designs. 

https://www.lowes.com/pd/VEVOR-Swivel-Rivet-Tool/5015875815?store=&cm_mmc=shp-_-c-_-prd-_-hdw-_-ggl-_-PMAX_HDW_000_Priority_Item-_-5015875815-_-online-_-0-_-0&gclsrc=aw.ds&gad_source=1&gad_campaignid=21797082881&gbraid=0AAAAAD2B2W8PXvpH2ydoq7-aEQ1-fOIZF&gclid=CjwKCAiAt8bIBhBpEiwAzH1w6Y45dp7qXN_M4JNdpukWTS19-RZFR5RoOUpu6eKK6iRnAzlKPPY8OxoCl1oQAvD_BwE

Guy

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From: pearso...@googlegroups.com <pearso...@googlegroups.com> on behalf of Dave Cole <dave...@gmail.com>
Sent: Monday, November 10, 2025 11:05 AM
To: pearso...@googlegroups.com <pearso...@googlegroups.com>
Subject: Re: [pearson ] how much air does an engine need?

 

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[Guy Johnson]

Jim, I don't remember which engine you have. I added the PCV kit to my atomic 4 and it does a much better job of containing the blow-by then the old rubber hose did. 

Guy

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From: pearso...@googlegroups.com <pearso...@googlegroups.com> on behalf of James Keszenheimer <jkesze...@gmail.com>
Sent: Monday, November 10, 2025 11:42 AM
To: Pearson Owners Group <pearso...@googlegroups.com>

Subject: Re: [pearson ] how much air does an engine need?

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[James Keszenheimer]

Ooh, I like that idea. I can use that for my bimini tubes. I was using sheet metal screws instead of rivets so I could take it apart but they don’t thread in well.

Guy, do the rivets hold well in the fiberglass without rotating? Do they bend around the back surface like a regular rivet?

JIm

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[Jim Keszenheimer]

Yup A4 here too. I was wondering if that kit was worth doing. I might try that. Thanks for the info!

On Nov 10, 2025, at 11:45 AM, Guy Johnson <guy...@hotmail.com> wrote:



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[Guy Johnson]

I also found some with 4 'legs' like a toggle bolt. 

Guy

Ooh, I like that idea. I can use that for my bimini tubes. I was using sheet metal screws instead of rivets so I could take it apart but they don’t thread in well.

Guy, do the rivets hold well in the fiberglass without rotating? Do they bend around the back surface like a regular rivet?

JIm

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From: pearso...@googlegroups.com <pearso...@googlegroups.com> on behalf of Jim Keszenheimer <jkesze...@gmail.com>
Sent: Monday, November 10, 2025 12:06 PM
To: pearso...@googlegroups.com <pearso...@googlegroups.com>

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[Guy Johnson]

These are the nuts with the legs. 

https://www.amazon.com/dp/B07VC445D8?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_12

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From: pearso...@googlegroups.com <pearso...@googlegroups.com> on behalf of Guy Johnson <guy...@hotmail.com>
Sent: Monday, November 10, 2025 12:09 PM

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