forestfighter
ZR-TEC RALLY TEAM
- Joined
- Jun 13, 2008
- Messages
- 315
Hi guys,
Some of you might have seen my MG ZR rally car which I put a B16 engine into? Well here's a few recent shots to keep you updated. I had a slight mishap at a test session the other week and have done some engine damage - perhaps you guys may be able to help advise me?
Engine is a B16A block with Eagle rods and Wiseco 12.5:1 high comp pistons. Bottom end all balanced. Head is a stock B16B with Type R cams - stock springs etc. Head has been flowed. ARP throughout. Titan Motorsport throttle bodies. Big manifold with 2.5" straight through system. S300 ECU etc etc. The car made 170whp at 8800rpm - car absolutely flies and I have had top threes in all 3 events this year. Car is going well.
A couple of weekends ago though, I was doing a test day at Blyton. Changing from 3rd to 4th I hit the limiter (not unusual for a rally car) and then the engine lost all power and came to a stop. Compression substantially down and was backfiring through the inlet when spun over. Presume bent inlet valves at this stage but haven't yet taken head off. I presume valve float at high rpm due to stock valve springs?
Question is - are Type R valves the same as B16A ones as I have a spare head. Also, whilst taking the head off and putting a new head gasket on etc, I am obviously going to upgrade springs, retainers and also cams. Whilst being mapped the car showed great promise to make some really good power - limited by the valvetrain only being stock we think. Question is, considering it's intended use, what cams would people recommend? Pro 2's, Toda's, Crower? I would like to see 200whp out of it, and imo, I have everything else on the shopping list to make this power other than cams. My other question and concern was valve to piston clearance if I went for bigger cams. What is known to clear and what will I have problems with? The head had a decent skim when built also... I don't know the actual end compression ratio but It should be high.
Any advice would be great!
Since last posting progress pics, here's some photos after a full shell paint and rebuild. Tried to add a few snaps of the upgrades since the last update, too.
AP Racing 5200's with 330 bells and rotors are a new addition since the rebuild.
New Ohlins S1600 3 way adjustable shocks.
And here's the important bit - the engine bay.
Cheers guys!
Some of you might have seen my MG ZR rally car which I put a B16 engine into? Well here's a few recent shots to keep you updated. I had a slight mishap at a test session the other week and have done some engine damage - perhaps you guys may be able to help advise me?
Engine is a B16A block with Eagle rods and Wiseco 12.5:1 high comp pistons. Bottom end all balanced. Head is a stock B16B with Type R cams - stock springs etc. Head has been flowed. ARP throughout. Titan Motorsport throttle bodies. Big manifold with 2.5" straight through system. S300 ECU etc etc. The car made 170whp at 8800rpm - car absolutely flies and I have had top threes in all 3 events this year. Car is going well.
A couple of weekends ago though, I was doing a test day at Blyton. Changing from 3rd to 4th I hit the limiter (not unusual for a rally car) and then the engine lost all power and came to a stop. Compression substantially down and was backfiring through the inlet when spun over. Presume bent inlet valves at this stage but haven't yet taken head off. I presume valve float at high rpm due to stock valve springs?
Question is - are Type R valves the same as B16A ones as I have a spare head. Also, whilst taking the head off and putting a new head gasket on etc, I am obviously going to upgrade springs, retainers and also cams. Whilst being mapped the car showed great promise to make some really good power - limited by the valvetrain only being stock we think. Question is, considering it's intended use, what cams would people recommend? Pro 2's, Toda's, Crower? I would like to see 200whp out of it, and imo, I have everything else on the shopping list to make this power other than cams. My other question and concern was valve to piston clearance if I went for bigger cams. What is known to clear and what will I have problems with? The head had a decent skim when built also... I don't know the actual end compression ratio but It should be high.
Any advice would be great!
Since last posting progress pics, here's some photos after a full shell paint and rebuild. Tried to add a few snaps of the upgrades since the last update, too.
AP Racing 5200's with 330 bells and rotors are a new addition since the rebuild.
New Ohlins S1600 3 way adjustable shocks.
And here's the important bit - the engine bay.
Cheers guys!
