- Joined
- Aug 2, 2000
- Messages
- 11,441
Pistons look OK, which end is the arrow pointing to?
I can't remember but I drew an arrow on the block will have checkPistons look OK, which end is the arrow pointing to?
This confuses me even more! The 205 haynes manual says an xu8v head is 141mm but your picture and the 405 haynes manual says 158mm.Figures for distance H
Measured with cam fitted and torqued down. Different heads are stamped with different numbers which indicates std or oversize cam journals.
oh lovely. more confusionI've got a Haynes 306 manual and it states the XU & XUD head thickness is 157.4-157.7mm.
I can't remember but I drew an arrow on the block will have check
This confuses me even more! The 205 haynes manual says an xu8v head is 141mm but your picture and the 405 haynes manual says 158mm.
Does anyone know what cc the chamber should be? The engine builder I'm dealing with said we could go off that if I can find it but I havent seen it aywhere it the haynes manuals yet
he can cc it but want's to know what it is standard so we have a base to go off. I would also like to know what it should be standard so I can learn more about all of this and this is the 141mm mentioned in the 205 manualif your engine builder cant cc the chamber id be shopping around.
405 engine in Haynes is possibly the downdraft port SRi engine (D6A, D6D). This was fitted with flat top pistons in Euro spec, so disregard. The version we got here (DFV) had DFZ style pistons so only gave 8.3 to 1. This engine was also used in the BX 8V GTi.I can't remember but I drew an arrow on the block will have check
This confuses me even more! The 205 haynes manual says an xu8v head is 141mm but your picture and the 405 haynes manual says 158mm.
Does anyone know what cc the chamber should be? The engine builder I'm dealing with said we could go off that if I can find it but I havent seen it aywhere it the haynes manuals yet
I'm confused why you're considering double valve springs. An engine needs to be matched in its components and to the gearing, if it's going to be useful package. In your case, you're limiting RPM by camshaft choice, which in turn is limited by CR. The gearing has to match the RPM range of the engine. Your decision to run highway gearing and keep the CR modest, means it doesn't need a lot camshaft and thus probably not double valve springs. Until you have the camshaft and have measured the installed height of the standard valve springs, you really don't know where you're heading with springs. I would imagine though, that the standard springs will be fine when installed with enough seat pressure. It's only a question your engine builder can answer.
To answer your question though, the head will need to be machined around the spring/guide area, to accept the new spring bases supplied in that kit.
1st and 2nd in an Mi16 are the same as the S3 205 GTi ratios but with a 4.43 FD instead of 3.6. From there they are a bit wider than the GTi ratios to give a good top speed without the need to go to a 6 speed. The Mi16 box is a massive improvement for an Si.
I've been driving mine around for the past two days, goes so much better than my auto and I'm sure the engines are pretty much the same. The ZF is a very good auto box but needs at least one more ratio. Standard Si manual would be in the middle of the two for performance.
Car repairs now allowed so I got an ABN and signed myself off (allowed) as a permitted employer. Will run the engine in when the fuel pump arrives, booked in for tuning on the 27th, but will need to get a better exhaust system first.That's good to hear then. we had an autox last week and the standard gearing really made me suffer. the first part was up a hill so the car struggled and 3rd gear on the faster parts didn't really feel like I was accelerating much. courses here a set up for bigger American cars (about 11 of the 50 cars we corvettes). here is a pic from it!
Has Victoria changed stages with isolation so you can get the car tuned or are you driving around near your home?
I'm considering them cause I don't know any better mate. I'm new to this and trying to figure things out. I'm wanting to make my engine have more power but be strong so thought they would help. When the car gets used for autox or when I was in aussie and did khana's the car usually saw the limiter fairly often so I thought a more aggressive cam and springs would help there too. I love revving it out and would love for it to have more up top.
CR is limited by the octane used right? or can that be solved with the right tuning and having the right parts?
Also gonna take your advice and look for a shorter ratio box to use. I know these options aren't what you said to use but will start off with my spare one and look for an mi16 box because that is what's available in North America.
0.12mm (0.0047”) is an enormous amount. It would have been rattling badly. He must have measured in the wrong spot.
The oil pump is the most reliable part of XU engines. They rarely need replacing.