Home build 700hp Hawkeye
16 November 2016, 03:49 PM
#31
18 November 2016, 07:48 AM
#39
What did it make in the end?
18 November 2016, 12:56 PM
#40
We stopped play at 630/600 at 2.1bar, didnt see any need to turn the boost up any further as thats more than enough for now. We will push things a bit further after a few months of seat time
18 November 2016, 01:19 PM
#41
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I had some base mapping done a few weeks ago so yesterdays session was to turn the power up. Everything went to plan without any issues so was quick and pain free.
We stopped play at 630/600 at 2.1bar, didnt see any need to turn the boost up any further as thats more than enough for now. We will push things a bit further after a few months of seat time
We stopped play at 630/600 at 2.1bar, didnt see any need to turn the boost up any further as thats more than enough for now. We will push things a bit further after a few months of seat time
Have you got a build thread Dubzy?
18 November 2016, 01:41 PM
#42
Not as yet mate but i will get one up soon when i get some free time
Right, back to Daz's car....
What size intercooler pipework have you got on it Daz ?? im currently on 2.5" and not sure if its worth going up to 3" as my core has 3" outlets.
Right, back to Daz's car....
What size intercooler pipework have you got on it Daz ?? im currently on 2.5" and not sure if its worth going up to 3" as my core has 3" outlets.
18 November 2016, 10:03 PM
#43
Drive like missy daisy? Does she hit 2.0 bar every time she drives? 
IC pipework is 2.5inch.
Core is a Process West which is around 110mm thick iirc. That also has three inch outlets but seems happy enough on the 2.5 inch pipework.
IC pipework is 2.5inch.
Core is a Process West which is around 110mm thick iirc. That also has three inch outlets but seems happy enough on the 2.5 inch pipework.
19 November 2016, 06:13 PM
#45
Long story short, I ran it in on the map that was on the car before i bought it as i essentially only rebuilt the engine I didn't change anything as such. Technically it could have been run full chat on that map.
However after lots of head scratching it turns out the valves were very slightly hitting the pistons when on full advance which when running in an engine isn't very often. So despite the later remap by a different mapper the damage had already been done and the valve fatigue had started already. It wasnt until abut 5000kms later that it eventually let go.
I did a write up on it somewhere where I took a **** load of pictures when I was trying to find the issue. I eventually did by reassembling the engine with some plasticine ontop of the pistons and setting the cam advance to where the original mapper had set it. You could see exactly where the valves were hitting the pistons. The cut outs on the Cosworth pistons didn't exactly help matters either as they were too small. The Wiseco ones in now are much much better in that respect.
I've roughly 8,000 miles on this engine since i rebuilt it all good so far, touch wood.
However after lots of head scratching it turns out the valves were very slightly hitting the pistons when on full advance which when running in an engine isn't very often. So despite the later remap by a different mapper the damage had already been done and the valve fatigue had started already. It wasnt until abut 5000kms later that it eventually let go.
I did a write up on it somewhere where I took a **** load of pictures when I was trying to find the issue. I eventually did by reassembling the engine with some plasticine ontop of the pistons and setting the cam advance to where the original mapper had set it. You could see exactly where the valves were hitting the pistons. The cut outs on the Cosworth pistons didn't exactly help matters either as they were too small. The Wiseco ones in now are much much better in that respect.
I've roughly 8,000 miles on this engine since i rebuilt it all good so far, touch wood.
22 November 2016, 01:18 PM
#48
Long story short, I ran it in on the map that was on the car before i bought it as i essentially only rebuilt the engine I didn't change anything as such. Technically it could have been run full chat on that map.
However after lots of head scratching it turns out the valves were very slightly hitting the pistons when on full advance which when running in an engine isn't very often. So despite the later remap by a different mapper the damage had already been done and the valve fatigue had started already. It wasnt until abut 5000kms later that it eventually let go.
I did a write up on it somewhere where I took a **** load of pictures when I was trying to find the issue. I eventually did by reassembling the engine with some plasticine ontop of the pistons and setting the cam advance to where the original mapper had set it. You could see exactly where the valves were hitting the pistons. The cut outs on the Cosworth pistons didn't exactly help matters either as they were too small. The Wiseco ones in now are much much better in that respect.
I've roughly 8,000 miles on this engine since i rebuilt it all good so far, touch wood.
However after lots of head scratching it turns out the valves were very slightly hitting the pistons when on full advance which when running in an engine isn't very often. So despite the later remap by a different mapper the damage had already been done and the valve fatigue had started already. It wasnt until abut 5000kms later that it eventually let go.
I did a write up on it somewhere where I took a **** load of pictures when I was trying to find the issue. I eventually did by reassembling the engine with some plasticine ontop of the pistons and setting the cam advance to where the original mapper had set it. You could see exactly where the valves were hitting the pistons. The cut outs on the Cosworth pistons didn't exactly help matters either as they were too small. The Wiseco ones in now are much much better in that respect.
I've roughly 8,000 miles on this engine since i rebuilt it all good so far, touch wood.
What a disaster, and one waiting to happen too. It sounds like an endorsement for pistons other than Cosworth, surprising that they are unaware of the problem. I guess you would now test valve/piston clearance on full advance as a matter of course when building an engine.
23 November 2016, 01:43 AM
#49
Im being a bit hard on Cosworth there as there isn't an issue if the cam advance isn't advanced too far but the guys who built and tuned the car were just **** I unearthed all sorts of crap from them when I tore the engine down when I first bought the car. (i bought it with an engine failure). The Wisecos though have a far bigger ptv clearance. But you're right it'll be a dry build with plasticine ontop of the pistons from now on!
Last edited by dazdavies; 23 November 2016 at 10:55 AM.
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