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Forum: Tech / General Engine
06-21-2016, 06:44 AM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Here is the maximum temperature (in °C) we have reached for now, that was a 1h trip in the mountains, so heavy hills and low speed thus low cooling. From 1300 to 4300 feet. The average outside...
Forum: Tech / General Engine
06-21-2016, 04:36 AM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Here is the Ebay ID of the "mean" guy! :)

https://cimg8.ibsrv.net/gimg/www.thirdgen.org-vbulletin/1329x180/80-18_340056bd2e781f376035e8b80bbe5074444c29c2.jpg


Do not worry we mannaged to have...
Forum: Tech / General Engine
06-21-2016, 04:31 AM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Wooow Thanks a lot! It seams my understanding of the cooling flow was really bad!

We have added a pipe at the other side of the head to prevent the air pocket. Hope it will work!
So I will ASAP...
Forum: Tech / General Engine
06-20-2016, 04:24 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

First, thanks a lot for your kind remakrs, we do have the same mind! :)

Yes it still ok on the road, even if it started to heats a litle more than usual, but thanks to the fan no problems, even...
Forum: Tech / General Engine
06-20-2016, 04:01 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Yes we had the same idea at first.. but if you have a closer look at this piscutes, you will see it is almost impossible!
...
Forum: Tech / General Engine
06-20-2016, 03:55 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Homemade pulley. On the alernator, the pulley is twice bigger than the stock one but still have enough volts. I made them so I can use cheap belts! :), and of course made them very ligth...
Forum: Tech / General Engine
06-19-2016, 04:19 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

We will check that when injection will be finished! :) Nonsens with the TBI on this intake. but we already feel a massive increase of torque, at least! :)

I let you know when everything is over.
Forum: Tech / General Engine
06-19-2016, 03:26 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

And "Voilą"!!!

Ho by the way we have only put this bloody TBI on the intake to try if everything was ok. We will of course modifiy the intake and adapt 8 injectors. TBI is of course a NONSENS!
...
Forum: Tech / General Engine
06-19-2016, 03:19 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Since there was no cooling holes on the manifild side of the LT1 heads, we had to "bypass" it and link both water circuits
...
Forum: Tech / General Engine
06-19-2016, 03:11 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

As you may have notice, LT1 heads do not have the same threads positions and angle as Lo3 heads. Thus we had to make new one to adapt our PERFORMER EPS intake manifold.

...
Forum: Tech / General Engine
06-19-2016, 03:07 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

We triple check the cc of combustion chamber and where really surpise to realise that one of them was 5cc below the others! Wich is A LOT!!! Seams to be because of a bad casting... We had to increase...
Forum: Tech / General Engine
06-19-2016, 03:02 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Considering our camshaft:

LT4 Hotcam: Intake open: 30.5 BTDC Intake close: 68.5 ABDC
Exhaust open: 78.5 BBDC Exhaust close: 28.5 ATDC

We choosed this DCR:
...
Forum: Tech / General Engine
06-19-2016, 02:52 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

THese heads seams to be made with A356 casting aluminium (full of silicium)

We had to weld 2 cooling holes for it can fit the LO3 sbc.

Of course the best is to weld with a TIG, but since...
Forum: Tech / General Engine
06-19-2016, 02:35 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

The LT1 HEADS

https://cimg3.ibsrv.net/gimg/www.thirdgen.org-vbulletin/900x1600/80-1_71a62abf8cc864e5d40b155790a0adb531db494e.jpg

Many valves where bent, but we manage to save all of them.
...
Forum: Tech / General Engine
06-19-2016, 02:30 PM
Replies: 27
Views: 3,468
Posted By davidmoret

Re: LT1 Heads on LO3, switzerland DID IT!!!

Thanks to ebay, we have found some old LT1 heads for only 150 bucks.

The seller sayd "These haeds are in perfect shape and almost finished to be ported. Very good heads!!!"
...
Forum: Tech / General Engine
06-19-2016, 02:19 PM
Replies: 27
Views: 3,468
Posted By davidmoret

LT1 Heads on LO3, switzerland DID IT!!!

Hello everyone!

It is switzerland again! (last thread (https://www.thirdgen.org/forums/tech-general-engine/729362-bloody-compression-ratio-switzerland.html)) So first sorry for my bad english!
...
Forum: Tech / General Engine
03-01-2016, 06:40 AM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Hello again!

I have heard my stock 14102187 heads are one of the worst chevy has ever made. Since they are really heavy as well I am considering to buy used alu heads.

I have found these on...
Forum: Tech / General Engine
02-19-2016, 01:11 AM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Ok thanks everyone! Thanks to you all I think I am done with the SCR/DCR!:)

By the way... any ideas of a thread speaking of a mod for my cylinder heads? I really hesitate to drill intake and...
Forum: Tech / General Engine
02-18-2016, 04:07 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

hahaha thanks but... what is a "pond"? (see... I told you!:))
Forum: Tech / General Engine
02-18-2016, 12:03 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Ok so if I have well understand what you said, the higger octane, the less the engine will knock thus less timing retard and thus better perf. So why are gas station selling lower octane? Because...
Forum: Tech / General Engine
02-18-2016, 11:22 AM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Thanks everyone! I really apreciate!

What about this one? => http://www.summitracing.com/int/parts/fel-1094/overview/make/chevrolet
...
Forum: Tech / General Engine
02-18-2016, 01:21 AM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Thanks for the tip! I had never heard about DCR before since I am no car-mechanic...

So, I have read a lot about DCR these days and now I try to compute it.
...
Forum: Tech / General Engine
02-18-2016, 01:09 AM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Yes you're right! Last time I have ordered some U-pipes to weld my exhaust. The U-pipes cost me around 80$, but the shipping cost with the custom: 359$ !!!!!!! :mad:

Imagine how much will cost...
Forum: Tech / General Engine
02-13-2016, 09:41 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

Thanks a lot for the correct specs! Now I have my 9.3!!!
I was worried the LT1 camshaft shape would smashed the valves at the exhaust. But since it is a "non-interference" engine... :)



...
Forum: Tech / General Engine
02-13-2016, 02:04 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

2) I am very worried of smashing my valves against the pistons if I manage to mill my stock heads (14102187)... I don't know if you understand what I mean.... Lets draw:

...
Forum: Tech / General Engine
02-13-2016, 02:04 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Re: Bloody compression ratio, Switzerland needs help!

The problems are:

Even if I spend about 25 hours a day on this f*** amazing forum (thirdgen is realy the Bible!), I still cannot find all I need....

1) I guess my LO3 305 should have a 9.3:1...
Forum: Tech / General Engine
02-13-2016, 02:02 PM
Replies: 31
Views: 2,666
Posted By davidmoret

Bloody compression ratio, Switzerland needs help!

Hello everyone!

I am from Switzerland (French speaking side actually), so I will do my best with english, but it aint really good... sorry!

I am the happy owner of a 89 formula LO3 305 TBI...
Showing results 1 to 28 of 28


 
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