I have a choice of 3 engines...which one to get?
10-21-10, 04:03 PM
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I have a choice of 3 engines...which one to get?
Hey friends! Long time no see, I still haven't replaced my RX from years ago but am not building an old VW GT40 replica from the 70's and am putting a rotary in it. My goal is the least money and most power. I found a guy locally that has 3 engines available for me for approx $500 and I'm not sure which one to choose.
Option 1: 12a Street Ported, rebuilt by Atkins with 5000mi on rebuild
Option 2: 12a Bridge ported, rebuilt by some other local company, 30k on rebuild
*note: both 12a's come with a delorto setup and he thinks they have upgraded apex seals and springs from atkins
Option 3: Stock 13b, not sure if it's rebuilt but atkins ran compression tests on it and it came out perfect, 130k mi on it total, maybe less if rebuilt.
Again, I'm looking for the most power for the cheapest price. I can get either of the three for the same price, and then will have maybe another $500 for tuning to get them how I want. My thought is that the 13b might be good since it's easier to turbo (right?) but if I got one of the ported 12a's and spent the money getting that turboed it would probably make much more power than the 13b...please talk amongst yourselves.
Option 1: 12a Street Ported, rebuilt by Atkins with 5000mi on rebuild
Option 2: 12a Bridge ported, rebuilt by some other local company, 30k on rebuild
*note: both 12a's come with a delorto setup and he thinks they have upgraded apex seals and springs from atkins
Option 3: Stock 13b, not sure if it's rebuilt but atkins ran compression tests on it and it came out perfect, 130k mi on it total, maybe less if rebuilt.
Again, I'm looking for the most power for the cheapest price. I can get either of the three for the same price, and then will have maybe another $500 for tuning to get them how I want. My thought is that the 13b might be good since it's easier to turbo (right?) but if I got one of the ported 12a's and spent the money getting that turboed it would probably make much more power than the 13b...please talk amongst yourselves.
10-21-10, 05:45 PM
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Like I said, after buying the engine I'll have around $500 to put into the engine...so buying the 13b, rebuilding and porting and turboing it would likely cost a tad more than $500. The idea of buying both the 12a's isn't bad though...just in case right?
Is there a "buying a used rotary engine" guide anywhere? Like tips from the experienced on things to check out in particular?
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10-21-10, 07:15 PM
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Ill be talking with him again tonight and will ask if it's a 4 or 6 port engine. Ok time for a n00b question...is it possible to see the size/shape of the intake port job on a 12a with the intake off without tearing it apart?
10-21-10, 07:38 PM
#14
Easiest way to check compression would be with a power drill (if they are out of the car) IMO. A 13B would be awesome but the 12A only has 5K miles and was built by Atkins Rotary. Either way make sure you keep us informed and post pics when you make up your mind. Oh I've used a telescoping mirror to check out ports. Works well, just need to remove the intake manifold.
Last edited by Jibaro 12A; 10-21-10 at 07:42 PM.
10-22-10, 07:38 AM
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Option 1 is clearly the winner - a fairly fresh re-build by a reputable company and is street ported. @ $500 thats a steal! But what proof do you have that it was rebuilt by Atkins? Receipts?
Option 2 is a waste of $$$ imho. 30K miles on a Bridge? I call BS. Check the compression - its most likely way down - not to mention...have you ever driven a bridge? And tuning them is a bitch if the carb wasn't built right!
Option 3 - actually was a tough call. I'm a believer in 13bs for stock power and reliability. The SP 12A is probably higher HP, but the 13b has more long term potential. Your call.
My choice for the budget minded buyer is option 1. Best bang for the buck.
Option 2 is a waste of $$$ imho. 30K miles on a Bridge? I call BS. Check the compression - its most likely way down - not to mention...have you ever driven a bridge? And tuning them is a bitch if the carb wasn't built right!
Option 3 - actually was a tough call. I'm a believer in 13bs for stock power and reliability. The SP 12A is probably higher HP, but the 13b has more long term potential. Your call.
My choice for the budget minded buyer is option 1. Best bang for the buck.
10-22-10, 08:31 AM
#17
Option 1 - Keep the 12A, and you don't have to modify anything else in your system.
It will be bolt in - especially if you keep your Webers, and no real tuning will be necessary.
Save the Dell'Ortos for a future 13b or sell them to make back half your money.
It will be bolt in - especially if you keep your Webers, and no real tuning will be necessary.
Save the Dell'Ortos for a future 13b or sell them to make back half your money.
10-22-10, 09:01 PM
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My vote goes for the 12a streetport hands down. Especially considering your situation, and the fact that it has by far the lowest miles and it was rebuilt by a reputable company.
10-23-10, 05:28 PM
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The guy with the engine said the Atkins engine has a stamp or something welded on it from Atkins that they do when they rebuild an engine, is there any truth behind this?
10-24-10, 02:13 PM
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Alright sounds good, I've been searching for info on them doing that but have not been able to find anything. I haven't been able to call since they aren't open on weekends. Hopefully i'll be able to check the engines out this evening or something, if so I'll take pics and post them up.
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