As stated above, anybody know these seals? Searched but couldnt find a thing.

http://www.hurley-engineering.ltd.uk/racingtips.aspx

What are you guys first impressions?

Rogier

 

Why would you use a 3.5mm seal, there is big controversy over using 3mm seals because, they are kind of a band-aid, and 50% more weight and mass, and a bad detonation will kill them just the same as 2mm seals. 3.5mm seals make no sense at all, just a fix for a messed up rotor.

 

They aren't JUST a fix for a messed up rotor! People like them because they withstand a tad bit more abuse.

I wouldn't buy anything from hurley. If you want to know why, search.

 

Hell, let's just back to the old school 10mm apex seals already!


-Ted

 

^^^lol

I know it sounds crazy, but proper tuning also let's an engine take a tad more abuse. Plus 3mm (and larger) seals are more likely to float at high RPM's. Just my $.02

 

high RPM's = ??? ?

 

Maybe you're an expert tuner. You think everyone else is?

 

Was just curious if anybody has used those. I have read several threads about 2 or 3mm seals. Both make sense.

Anybody over here who has had them both?

 

wernt they 6mm?

 

Stick with 2mm unless you need to save you rotors. There is no need for 3mm seals.

 

Will do, but depends on my rotors when they come out of the car. What brand do you recommend, what brand do you work with?

 

No, I don't think I am. However, I think anyone who can fork out the money for this kind of engine work can pay for proper tuning.

 

A local shop bought Petitt's old GTC Car (the white and yellow one) and brought it to Europe to race. after 2 engine failures (broken seals) they decided to go from 3mm seals to 3.5mm. All engines are Pettit build and shipped to Europe.

I've searched for the specs Petitt had on their race engine but could not find them.
I was at a test day with this car (2nd engine,3mm seals) and could read the Halltech lap info on the labtop. As far as I could see the turbopressure went upto 20psi (making +- 450HP)

Every engine failure was due to seals braking. Like I said, they now changed to 3.5mm's but in my opinion it won't solve the problem and for me it's in the tuning of the engine.

It should stay together with 3mm seals at 20psi with decend tuning, no question

Aother thing was that it overhead with the FMIC as Petitt race it. So they went to V mount and test made clear that engine tempes dropped

 

Sounds interesting, where in Belgium?

 

Two words for you/them: water injection. Oh, and what octane gasoline were they running 20 psi on?

 

Jep in Belgium. The tests were in Zolder, which is about 10 miles from where I live, and were meant for setting up the car for a 24hours race.Which they didn't make

Water injection,... maybe, i'm not familiar with the technical regulations in that class and if it's allowed. On the other hand I'm not sure waterinjection is that handy in endurance races. On top, I'm not familiar with the inside technical info on that system, just know the principle.

I will mail them for some info on the fuel they use. Remember that in europe we have 95 and 98 octane at the pump ;-). i'm sure it wil have more for track use.

I"ll also investigate on the turbopressure they have set. What boost figures etc.

Thanks for your intrest.
Neal

 

Ok Update: I got some info from the techician:
According to his mail:

No significant porting, just polishing inlet/outlet. no change in porttiming (comparred to stock I guess)

Fuel rails; 1st and 2nd same size Siemens 3105 after a search they are 903cc/hr injectors.

Single turbo setup don't know exactly which one running: utbro pressure ar 0.7bar upto 0.8/0.9 as wanted

Ignition timing according turbopressure

Engine steering/ Halltech E6K

I asked him if they had a temperature sensor on the inlet, no answer

According their info this would make about 450HP, which is VERY optimistic given this data is correct.

My best guess is they need bigger injectors and get at least a decent streetport to achieve 450HP

What do you guys think?

 

What turbo(s)?

 

I already asked them but they were not sure. It's thesame setup Peitt used to race in the USA.

I put a thread in another part of this forum to find out the specs on Petitt's car as it was in the US to compare, but neither their site or a search provided an answer.

 

I hope that's a typo - "cc/min".
15cc/min fuel injectors are kinda small!


-Ted

 

The US uses a different octane rating system. Your 95 and 98 octane are about comparable to our 91 and 94 octane respectively, but non-US octane ratings have less quality control.

Assuming you mean 903cc/min, this would support 450bhp with a slightly high fuel pressure and/or a good BSFC.

 

fuel: 98 octane (sorry forgot that)

So you guys think this is a decent "race" setup all together?

 

Is the P/S and A/C removed? What kind of fuel pump (s)? What is used for boost control? I think that anything over 15 psi on any variant of modded stock turbos is asking for trouble.

 

No air pump or A/C. as I mentioned, we're talking about Petitt's old RX7 race car

see: http://www.pettitracing.com/rx7/index.htm
under racing.

boost is controlled by a mechanical exhaust wastegate and electronic boost controller in the car.