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914 Overhaul

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l_luv2_fly(at)yahoo.com
Guest

Posted: Sun Jun 01, 2008 2:22 pm Post subject: 914 Overhaul

Hi all,



I was wondering when it comes time to overhaul my 914 whether a more economical approach might be to purchase a new 912, install my exhaust, turbo, inlet manifolds and gear box onto the new block.  I could then reassemble the swapped parts onto my old 914 block and sell it on eBay as a used 912 to offset the cost.



This approach would give mostly new parts with the exception of the turbo, gearbox and other bits unique to the 914.  I'd be interested in anyones thoughts on this.



Paul

         [quote][b]

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Jun 02, 2008 12:49 am Post subject: 914 Overhaul

Hi! Paul   

One would need to see all the “numbers “ to make a considered assessment, however sounds a bit like “spoil the ship for a hap’orth of tar” to me. Cutting corners never really pays dividends besides which your suggestion finishes up with mixed hours for flying regs.  

In other words  ..”pay peanuts  get monkeys!” .  

Regards  

Bob Harrison G-PTAG   

   

--

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Gilles.Thesee(at)ac-greno
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Posted: Mon Jun 02, 2008 4:37 am Post subject: 914 Overhaul

Paul McAllister a écrit :

 	  Quote: 	
		   Hi all,



 I was wondering when it comes time to overhaul my 914 whether a more 

 economical approach might be to purchase a new 912, install my 

 exhaust, turbo, inlet manifolds and gear box onto the new block.  I 

 could then reassemble the swapped parts onto my old 914 block and sell 

 it on eBay as a used 912 to offset the cost.



 This approach would give mostly new parts with the exception of the 

 turbo, gearbox and other bits unique to the 914.  I'd be interested in 

 anyones thoughts on this.


	


Paul and all,



You seem to suppose that a 914 overhaul is more expensive than a brand 

new 912 ? Is that really so ?

Also, the cost of the gearbox, carbs, turbo must go into the equation.



As a prospective buyer, I would be wary of a used 912 with a 914 serial...



Best regards,

-- 

Gilles

http://contrails.free.fr

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l_luv2_fly(at)yahoo.com
Guest

Posted: Mon Jun 02, 2008 6:06 pm Post subject: 914 Overhaul

Hi Gilles,



 	  Quote: 	
		  You seem to suppose that a 914 overhaul is more expensive than a brand 

new 912 ? Is that really so ?

-- 

Gilles


	


Actually to be honest I don't know the most recent cost for a 914 overhaul.  Two years ago I was quoted about $12,000 USD so I can only suppose that is cost more now.  I seem to recall that this didn't include replacing the turbo, or exhaust but did include a gearbox overhaul.



What is appealing about my idea is that for the most part I would end up with brand new parts, but this is based in the assumption that a 912 block, cam & heads are identical to a 914.  This would require quite a bit of research cross checking spare part  numbers to confirm.



Mine has 800 hours on it now and the only issue is an oil leak on the top of the engine that would require the crank case to be split to reseal.  



I have been told of an oil resistant "wick in" sealant made by Locktite that is made for this exact purpose so I am going to see if I can track some of this stuff down.



I'll keep you posted.



Cheers,  Paul





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icrashrc

Joined: 16 Mar 2006
Posts: 247
Location: Mishawaka, In

Posted: Mon Jun 02, 2008 11:54 pm Post subject: 914 Overhaul

I would think at the very least the pistons would be different. Most turbocharged engines run a lower compession ration to keep preignition at bay. Also, the 80 and 100 horse engines are not even the same displacement. Do you know if they started with one or the other when they developed the 914?

  

 Scott

www.ill-EagleAviation.com



Get trade secrets for amazing burgers. Watch "Cooking with Tyler Florence" on AOL Food.

  [quote][b]

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_________________
Scott

www.ill-EagleAviation.com

do not archive

rholder(at)avnet.co.uk
Guest

Posted: Tue Jun 03, 2008 3:29 am Post subject: 914 Overhaul

Icrashrc(at)aol.com wrote:



 	  Quote: 	
		   I would think at the very least the pistons would be

 different. Most turbocharged engines run a lower

 compession ration to keep preignition at bay. Also, the

 80 and 100 horse engines are not even the same 

 displacement. Do you know if they started with one or

 the other when they developed the 914?


	


The Lockwood catalog is very useful with this. there are

exploded diagrams of all the 912/914 parts with part lists

and applications.



Page 56 of their 07-08 catalog shows that the piston for

912S is 888 381 and the piston for 912 and 914 is 996 549.



The 912 (80 bhp) came first, then the 914 with the same

innerds, followed by the 912S (100 bhp).



According to this catalog the 912 and 914 heads are the

same, and the 912S head is different. Simiiarily the barrels.



If I was doing what you suggested I would buy the 912 for

all the parts and use the 914 block (I mean crankcase).

Whether there would be any value in the old-914-parts

built 912 I don't know ! There are a number of things that

wouldn't come with the new 912 - such as the double ganged

oil pump.



I suspect that buying a whole engine might well be cheaper

than buying the individual parts, as the parts are mighty

expensive ! But it might be best not to let your supplier

know what you intended to do !



Here in the UK I understand that such rebuilding may not

be permitted, but in the land of the free - you are free 



HTH



Richard Holder

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grahamsingleton(at)btinte
Guest

Posted: Tue Jun 03, 2008 6:05 am Post subject: 914 Overhaul

Paul McAllister wrote:

Paul

crankcase leaks are not uncommon. Also crankcase fretting, there are 

seals on the hold down studs and they get worn. Then oil goes up the 

studs and out at the base of the cylinder.

New engines have sealant round the base of the cylinders, which seems a 

bit like an afterthought!

Graham

 	  Quote: 	
		   Hi Gilles,

 >You seem to suppose that a 914 overhaul is more expensive than a brand

 >new 912 ? Is that really so ?

 >--

 >Gilles

 Actually to be honest I don't know the most recent cost for a 914 

 overhaul.  Two years ago I was quoted about $12,000 USD so I can only 

 suppose that is cost more now.

 Cheers,  Paul

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