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View Poll Results: What engine did you buy for your -14?
IO-390 17 50.00%
Thunderbolt-390 6 17.65%
XP-400 5 14.71%
Tricked out IO-360 or variant 3 8.82%
Other, please elaborate 3 8.82%
Voters: 34. You may not vote on this poll

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Old 09-08-2017, 06:47 PM
Av8rRob's Avatar
Av8rRob Av8rRob is offline
Join Date: May 2005
Posts: 211
Default What engine did you buy?

Curious to those who have already bought your engines for -14's what your choosing and why?

I'm really curious as to the difference between the -390 and -400? (Besides 10).
Another question is what does lycoming say about the hp difference between the standard IO-390 and the Thunderbolt?
Rob Lasater
Rv-14 still workin
Paid nov 2018

Last edited by Av8rRob : 09-08-2017 at 06:51 PM.
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Old 09-08-2017, 06:55 PM
Nova RV Nova RV is offline
Join Date: Aug 2015
Location: Leesburg, VA
Posts: 264

The Thunderbolt allows for more customization and the parts are balanced to tighter tolerances. More HP is not really expected and per my conversation with Lycoming at Sun N Fun any HP gains are probably nominal (2-3HP).
Chris Moon

Leesburg, VA
RV-14A kit # 140243 (flying as of 11/18)
VAF 2018 and 2019 paid
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Old 09-08-2017, 10:48 PM
Driving '67 Driving '67 is offline
Join Date: Dec 2011
Location: Port Credit, ON Canada
Posts: 166

I elected to go with the Thunderbolt option. I felt the uplift for the options was worth the money. The engine will have the Pmag/Slick combination with the Airflow Fuel Injection.

The engine is due in early November. Getting excited ....

RV 14A wing/tail/fuselage done
Doing the avionics/wiring harnesses

Serial 140118
Donation 2018/19

Last edited by Driving '67 : 09-08-2017 at 11:09 PM.
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Old 09-09-2017, 01:27 AM
control control is offline
Join Date: Feb 2006
Location: Stockholm, Sweden
Posts: 568

I was keen on alternatives as I would like to be able to skip 100LL... but in the end none of the alternatives made sense to me. ordered the 390 with one e-mag from Vans.
RV-14 kit #140138
I have entered the 90% done, 90% left to do zone
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Old 09-09-2017, 07:37 AM
jeffw@sc47's Avatar
jeffw@sc47 jeffw@sc47 is offline
Join Date: Aug 2014
Location: Simpsonville, SC (SC47)
Posts: 215

IO-390 Thunderbolt; one p-Mag, nothing on other side - added additional P-Mag from Emag. Airflow Performance fuel injection w/ purge valve.

Modifications needed were significant alterations to the intake air snorkle (had to be shortened approx 1/2" and different connection to the throttle body), fabricate mixture cable bracket to attach to engine near the throttle body, needed longer mixture control cable (+approx 10").
Jeff Warren
Simpsonville, SC (SC47 - 10nm NW Triple Tree, SC00)
1946 Bellanca Cruisair 14-13-2 (72 YRS OLD 8/15/18)
RV14A (N14ZT), Ser#140195
Start 10/11/14
Dues paid 12/2/18 (USArmy 2/67-2/70)

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Old 09-09-2017, 10:16 AM
Don E Don E is offline
Join Date: Aug 2016
Location: West Chester, PA
Posts: 48
Default IO-390

I ordered the stock 390. Carefully considered the T-bolt option, but couldn't make the cost and value compute. Stock engines are pretty smooth; the balancing aspect would have had the most value to me. Porting and polishing sounded really good, but this is a 2,700 RPM engine and it just seemed to me that the benefit would be much less than on a high-RPM race car engine. I really tried to find a way to quantify the benefit of doing it, but couldn't. Few are going to see the enhanced paint job. And there are a lot of other places to spend the extra 3,600 bucks. So I'll take my chances that the stock engine will be smooth enough. Ships mid-October. The T-bolt rep agree that dynamic prop balancing should be done with either engine, so I will do that. Prop is already here.

My engine is coming with one p-mag and a slick magneto. I will likely fly it that way before deciding to replace Slick with a second P-mag due to the high incremental cost of switching.

Last edited by Don E : 09-09-2017 at 10:18 AM.
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Old 09-11-2017, 10:08 AM
Gahannaflyer Gahannaflyer is offline
Join Date: Aug 2013
Location: New Albany, Ohio
Posts: 51

I went with a slightly different route. I dropped in a 400XP Superior with duel E mags and a Air Flow Performance fuel injection. I had Barrett do the engine for me and I am so far, very happy with the performance.

The fuel burn is less than 9 GPH at cruise and it runs surprisingly cool. Even the hottest days this summer I was just a bit over 300 deg F.

I had to modify the cowling slightly to accommodate the fuel controller. Although when I talked to the chaps at AFP, they said that if you just tell them ahead of time when they set up the unit for install, they will shorten the bottom elbow and the modification necessary will be minimal. The snorkel had to be modified too, so that it would slide over the outer part of the fuel controller and make a nice fit.

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