"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Pee Wee + SPI

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Old 04-08-2012, 10:14 PM
  #1
skaliwag
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Default Pee Wee + SPI

Anyone tried to give a Pee Wee a taste of SPI?
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Old 04-08-2012, 10:41 PM
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Default RE: Pee Wee + SPI

I'm pretty sure they already have it?
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Old 04-09-2012, 02:23 AM
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Default RE: Pee Wee + SPI

I've just checked 5 of mine-covering about a 30 year production range-they ALL have SPI-and without miking them, it seems to be the same-about 0.015" -in each case. I suppose it is possible that the R/C version-with the rotating exhaust throttle -might have had the lower edge of the exhaust port raised to eliminate SPI-as was done with the QZ 049-but as I don't have an R/C Pee Wee I am not in a position to confirm this.
How much SPI is optimum is another matter-presumably, you could play with cylinder shims a la Kustom Kraftsmanship- to set up the engine for optimum timing-but I've never heard of anyone producing 020 cylinder shims. given the size of the Pee Wee, you'd need a proportionately thinner range of shims than those used on 049s...........

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Old 04-09-2012, 10:14 AM
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Default RE: Pee Wee + SPI

I am sure not all did.
What about the ones that came with mufflers?
All 5 of my non RC ones hae it though.
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Old 04-09-2012, 03:27 PM
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Default RE: Pee Wee + SPI

When I posted this I was looking at one of my old motors. I had another look today and found the cylinder was not screwed home.. It now has SPI... Thanks all..
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Old 04-10-2012, 12:05 PM
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Default RE: Pee Wee + SPI


[quote]ORIGINAL: nitroairplane

I am sure not all did.What about the ones that came with mufflers? [quote]

.....I don't think Cox ever made a muffler for the Pee Wee. They did make a throttled version-with the same style of rotating baffle exhaust throttle used for the 049, 09 and 15 Medallions. These were not very common-and only appeared in the 80's or thereabouts. IIRC Davis Diesel (or it could have been Ace R/C) made a silicon rubber muffler which could be used on the Pee Wee, and an aftermarket muffler of soldered brass was offered in the UK in the late 1960's (probably as a result of the SMAE compulsory silencer rule)

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Old 04-10-2012, 03:01 PM
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Default RE: Pee Wee + SPI

I am 100% sure that cox made a pee wee muffler!
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Old 04-10-2012, 03:06 PM
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Default RE: Pee Wee + SPI

yeah.
http://coxengineforum.forumakers.com/t1827-lean-green-cox-machine
I have seen them in the past.
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Old 04-10-2012, 03:10 PM
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Default RE: Pee Wee + SPI

Yuo again look.
http://www.rcuniverse.com/forum/m_9124192/anchors_9124192/mpage_1/key_/anchor/tm.htm#9124192
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Old 04-10-2012, 07:12 PM
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Default RE: Pee Wee + SPI

OK I stand corrected.

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Old 04-11-2012, 07:10 AM
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Default RE: Pee Wee + SPI

And Ron Valentine just listed a pee wee with muffler on eBay if anyone is interested.
I am
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Old 04-13-2012, 04:46 AM
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Default RE: Pee Wee + SPI


Quote:
ORIGINAL: nitroairplane

And Ron Valentine just listed a pee wee with muffler on eBay if anyone is interested.
I am

Beware!

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Old 04-13-2012, 08:17 AM
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Default RE: Pee Wee + SPI

Cox sold the Muffler Kit .020 engine part# 2620 for a retail price of about $3.75 according to the one I'm holding in my hand.
It's a minature version of the ones sold for the .049, .09, and .15 engines. It took me years to find one. Good Luck !!
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