Have heard various explanations, all of which seem to differ.

I have an STI V1 with blueprinted engine. My engine has a major problem (big end failure likely).

Anyone shed any light on this?

Cheers,
Mark

 

My understanding is that a blueprinted engine is one that has been built from components all manufactured within the same tolerances - normally Subaru will have the pistons, rings, rods, cam's, follower's etc made to within + or - as certain figure.

Blueprinting takes this further so that all components weigh the same, fit the same etc. Leads to slightly better performance and (hopefully) reliability and for racing in restricted classes where actual tuning isn't possible and by that tuning can refer to replacing std components and replacing with uprated or higher performing items. A blue printer may build a single engine from 20 or so other standard engines just by selecting everything the same.

Does that help - I think I've confused myself.

Richard.

 

Lucky
Don't be confused, that sounded ok!
In a sentence a blueprinted engine is one which is precisely to the design spec.
JohnD

 

Or you could say, a blueprinted engine is one where the engine builder has used the specified manufacturing tollerances for that engine to their best performance advantage.

 

cheers guys - just means it might be more complicated for an engine rebuild.

 

Only if you have it rebuilt blue printed..

you could have a normal rebuild.. engine no longer blue printed but normal cost etc..

JGM

 

im sure mine was

 

Mine was blueprinted, I presume yours was too David.

 

cool - is there such a thing as normal cost LOL!! I'm being quoted from a guesstimate £1500 and beyond!

 

From iwoc.....but since September 1995 they have been built alongside the standard models to specifications and with parts outlined by STi. The engine benefits from a few tweeks such as being manufactured and assembled to higher tollerances (blueprinting) with some stronger and lighter items being used.

 

I thought secondhand engines were about £1500 for an STI plus perhaps a bit of inflation as everyone seems to be blowing them lately.. just drop another one in..?


then you KNOW what it is going to cost rather than the possibility of the rebuild costing more.

Try Rally Colin (posts on here) Grade A Subaru, Midland Impreza etc..

JGM

 

A couple advertised at specialists in Motorsport News (including this weeks edition out today), from memory about £2800 for a rebuilt motor (Sti 5 I think) and £1300 for one just out of a car.

 

Didn't realise that there was a "blue-print" for 2.3L engines Top security classification must be required prior to viewing?

Try David at http://www.apiengines.com/ for a standard engine rebuild. I spoke to him on the telephone yesterday and he was very helpful indeed. Sounds like they do lots of rebuilds to many different specs.

 

LOL at Callum There will still be clearances to equalise and optimise to fine tolerances plus balance issues.

 

Hi John,
Just trying to give you a while you are waiting for project "rocket engine" completion. You looked pretty down at TOTB - either that or you just didn't want to speak Hope your engine is coming along and that you get it going soon.

Blueprinting of any mechanical object will generally provide gains, though not necessarily cost effective ones I buy a lot of expensive, high end rifle components for work that are supposed to be right only to find that they need reworked before assembly. I know very little about engines but it would appear that they benefit in a smilar fashion. Sometimes you just have to stop measuring and get on with the job though

Mark - good luck with the rebuild - let us know how you get on.

 

I did want to speak but you caught me at a bad time - T-uk's clutch was slipping, we just had to turn the power down and he was about to run for the first time.

 

No problem John I guessed from the tense look on John's face that he was having a bad day. Given the loss of a full clutch & 50bhp he did extremely well on the handling circuit. Hope it's all fixed now. What about an update to your project thread? Speak to you soon

Edited cause my English is awful!

[Edited by Callum Ferguson - 8/14/2003 1:30:48 PM]